TPTB's Involvement with Fandom
Throughout fannish history, fandoms have had different levels of involvement with The Powers That Be, the creators of their source texts. This involvement has varied in intensity, taken on several forms, and had differing end results.
Some canon creators have had very positive involvement in their fandoms, while others prefer not to become involved; still other creators take a negative view of any kind of fanwork output involving their creations (see Professional Author Fanfic Policies). TPTB involvement with fandom has also given rise to some notorious incidents (including accusations of copyright infringement, lawsuits and bans on slash fanfiction), some of which had a chilling effect on all fannish output for that fandom.
In the era of social media, TPTB/fan interaction is much more normalised, and creators are more likely to want to cater to the whims of their fanbase (or to appear to cater to them) than to deter them. However, this leads to a different set of issues including problems like queerbaiting, fan service and Breaking the Fourth Wall.
Exciting Presence or Dampener of Creativity?A fan in 1996 wrote:
... I'm starting to worry about the high profile fandom has achieved because of its visibility on the net, specifically in cease and desist orders from studios who find out about fanzines online, and the chilling effect of members of the productions teams interacting with fans on open lists. But what happens is that fans start separate small lists to get around that, like the B5 [Babylon 5] fan fic group kept separate from the newsgroup JMS haunts. [referring to creator J. Michael Straczynski ]. It's great that fans have so much access to writers and actors and producers online, although any effect on series is negligible, but their presence can stop certain kinds of discussion as essential to fandom as chocolate and cats. Suck-up posts also seem to drive out deeper discussions, maybe no one wants to look too interested in the series (and risk being told to get a life) but many do like to curry favor. This is hardly unique to online fandom, however. 
See TPTB's Involvement with Fandom/Specific Fandoms for some more detailed info and examples.
Some fandoms, even very large ones, had very little or no contact with the producers, writers or actors. Some examples:
Some canon creators directly participated in fandom.
- by Twitter: see Teen Wolf
- Eli Roth has cyber sex with his fans shows off tissue evidence; Webcite (2009) "It may seem shocking in the moment but one day, sooner than you think, people will laugh at how this was such a big deal. Because what is it, really? An exchange of words, pictures. But to me it was more than that. It was some strange moment where we all just went into the danger zone and destroyed these walls we all took part in creating. And it felt so f-cking good."
- by consciously engaging; see Orlando Bloom
- by participating in online discussion groups; J. Michael Straczynski, the creator of Babylon 5, was a regular contributor to the newsgroups alt.tv.babylon-5, rec.arts.tv.sf.babylon5 and rec.arts.tv.sf.babylon5.moderated. See Babylon 5 for more.
- by writing introductions to zines: two examples: Reflections in a Shattered Glass which has an introduction by Terry Nation, and Security Check has one by Walter Koenig
- by commenting to zine eds on the zines a fan or zine ed had sent to them: an ad for Snakebit notes that both John Carpenter and Mike McQuay have wrote of their favorable impressions of the zine
- by allowing material of their own to be published in zines: Revenge of the Wind Rider says it has poetry by Leonard Nimoy in it that was printed with Nimoy's permission; Nichelle Nichols and DeForest Kelley who both had Trek poetry zines.
- by writing LoCs: Spockanalia has letters from Gene Roddenberry, D.C. Fontana, Leonard Nimoy, DeForest Kelley and James Doohan, and Cousins includes several lengthy communications by Robin of Sherwood's creator, Kip Carpenter
- with personal correspondence with fans: phone calls to BNFs, something Gene Roddenberry did
- appearances by the actors, directors, and writers at fan-run cons: Star Trek, Robin of Sherwood, and Blake's 7, others
- by requiring fans to send them their zine proposals and finished zines, see Open Letter to Star Wars Zine Publishers
- by writing, editing, and otherwise producing material in their own fandoms, see Marion Zimmer Bradley
- by creating doujinshi, either about their own commercially published manga or about other source works
Some Fans Don't Want TPTB's Involvement
- a Star Wars fan writes: "What do I want from Lucas film? To be left alone, mostly." 
- a Starsky and Hutch fan begs for the next Zebracon not to be in Los Angeles but somewhere in the Midwest. One reason: “If Spelling-Goldberg wouldn’t let Paulie put the guys’ pictures on T-shirts for a con in Chicago, what other kind of restrictions would be run up against if we held a con right there in their own backyard, where they could even sort of ‘drop by’ to check on things?”' 
- a Star Wars writes: "I'm not at all as enthusiastic about the pro fiction out there. Fortunately, I just kept myself from opening my mouth on the subject on the Fidonet SW echo (discussion), when I found out that Kevin Anderson was lurking there ... but now I can at last say what I really think about Jedi Search." 
Some Fans Directly, and Indirectly, Contacted TPTB
While some fans were "required" to send their fannish work to TPTB (See: Open Letter to Star Wars Zine Publishers by Maureen Garrett, other fans directly, or indirectly, voluntarily alerted the original creators of their fanworks. Sometimes this had positive results. Other times, not so much.
The Case of Chelsea Quinn Yarbro and The Holmesian FederationThe Holmesian Federation included a novella titled "The Adventure of the Gentleman in Black", written by Tina Rhea about a case in which Holmes & Watson encounter le Comte de Saint-Germain, the protagonist in a series of novels by Chelsea Quinn Yarbro who based her character on the Count of St. Germain, a historical figure from the 18th century. On learning of the novella's publication, Yarbro contacted legal counsel and sent Cease & Desist letters to the author and editor. A protracted dispute ensued; Yarbro's account of the matter appeared in consecutive issues of the SFWA Bulletin.  The case was eventually resolved when the fans agreed to publish notices acknowledging copyright infringement in industry trade publications, and to forward all remaining copies of the issue in question to Yarbro for destruction. Sources differ as to the specific publications in which the notices ran. Yarbro and others specifically cite Publishers Weekly as one venue; others mentioned (but not confirmed at this writing) include Locus and the SFWA Bulletin. A fan comments: "My own sense is that the Yarbro case is also not a definitive argument against fanfic. What got the fanwriter and editor into trouble in that one was that they personally and directly drew Yarbro's attention to what they were doing...and went ahead after she explicitly denied permission to publish. In a sense, this was the flip side of MZB's arguable error in judgment; where MZB attempted to get too involved with fanwriting, the Yarbro fanwriters attempted to get too involved with Yarbro." 
Other Examples of Contact with TPTB and Differing ResultsBefore George Lucas' edict, some fans volunteered their creations:
Another fan had this fear:
From a submission request for the zine Here Lies Illya Kuryakin:
One zine, Third Age, was dead in the water before it even began.
The editors of Snakebit wrote of the response they got when they sent their zines to some of the Escape from New York creators:Several months ago I wrote to J. Michael Straczynski to inform him of my plans to publish a fan publication based on Babylon 5. I finally received a reply a couple of weeks ago from Joanne Higgins (assistant to Straczynski) of Babylonian Productions. Even though my letter emphasized the fact that this fanzine was not for profit, Ms. Higgins has expressly forbidden me to publish Third Age, stating that "all publications using the Babylon 5 name must be licensed through Warner Brothers as they own the rights." Apparently Warner Bros does not share Paramount's view that fan publications increase fan awareness and commercial success of a series (Paramount has no problem with Star Trek fanzines as long as they are non-profit). Warner must also be unaware of the other B5 fan publications that are out there. As a result, I will not be publishing Third Age as planned. I've written back expressing my disappointment in this apparent "ban" on B5 fandom. 
Deb Walsh recalls her proposed 1988 Tanith Lee zine, "Ghyste Mortua." It was to be based on Lee's Kill the Dead novel which Blake's 7 actor Paul Darrow declared was based on the characters of Avon and Vila:John Carpenter was "... very impressed with the quality of the writing in Snakebit." And Mike McQuay said, "I read Snakebit the minute I got it out of my mailbox and loved it!"' The editors of Snakebit add: "Are we proud? You betcherass!! 
Another fan explained that she was sending copies of the zine to the actors themselves:..this zine was going to be my masterpiece. I had amazing stories - oh, fabulous stuff. Gorgeous art. It was going to be massive. I was exploring special black mailing envelopes, and I was designing a special insignia to use for wax seals on the envelopes. And I got involved in a very pleasant letter correspondence with the publisher of Daw Books, Donald A. Wolheim. Lovely man. I think I may have written originally to find out if there was any chance that 'Kill the Dead' might be reprinted... I mentioned the zine, he was thrilled. He mentioned the zine to Ms. Lee, she was appalled. She was very concerned at that moment in time that any hint that her novel - which was currently out of print - might be construed as stepping on BBC copyright. The zine died a sudden and definitive death. Much of the work I'd accepted found its way into other zines, but I could not publish it. 
The actor who played Julian Bashir was given three fiction zines at the second Lunch with the Doctor. The editor gave Sid a copy of Palpitations, and he said that he would record some of the stories on tape. Another fan gave him a copy of Doctor Julian Subatoi Bashir: This is Your Life:
At least one fan found herself disillusioned with the very show she'd based her letterzine on:
I chose to become involved with the Simon production offices, no one forced me to. But l've paid the price - the knowledge that real life problems such as networks, executives, ratings, production details and the personalaties [sic] of all those involved all dictate what we see on the air. lt's fun to totally immerse oneself in the fantasy world of Rick and A.J., but for me, it's become a luxury I can no longer enjoy. I know that we'll never see the type of episodes we talk about in this letterzine or in fan fiction and because I know that, I view Simon differently than I used to. Once you see behind the camera, it's hard to maintain the fantasy. I chose to see behind the camera, so l'm not asking for sympathy here, but nothing destroys illusions better than visits to the set and talks with people involved in the show. 
Using Social Media Exposure for a Cause
In the 2010s, many fans have begun communicating to The Powers That Be via Facebook, Twitter &c., supporting their favorite slash pairings and suggesting storylines in which they could be made canon. They make strong arguments in favor of establishing relationships between male stars in shows with fannish appeal; science fiction and fantasy, magic realism, "buddy cop" shows and action-adventure series. These fans often cite the need for more visible LGBTQ characters on television, making their petitions in terms of a call for visible diversity rather than a personal obsession or kink.
This has particularly been the case with Supernatural. Fans claiming to be LGBTQ, or to be supportive of same, have lobbied heavily for canon relationships between Dean and Sam Winchester, and especially for Dean and the angel Castiel (Misha Collins). Dean has had relationships with women in the past, especially Cassie (Megalyn Echikunwoke), to the chagrin of slash shippers. When Castiel had romance with a woman (April Kelly, played by Shannon Lucio) at the end of season 9, negative fan response pinned the meters. WB executive Chad Kennedy's Twitter account blew up after he said that the producers had not intended for either Dean or Castiel to be bisexual. He clarified that he did not write the show; that no one had pitched him an episode in which the male leads had romance with one another; but that he would not rule it out if such a script did come to him. 
Sherlock has received similar attentions from fans, including online petitions, but creator Steven Moffat says he has no intention of allowing the famous pair to consummate their relationship physically. 
TPTB? Who Cares About Them?At a recent science fiction convention, one relatively new fan contrasted her views towards TPTB with that of earlier fans. This statement not only reflects changes in studio attitudes towards fan creations, but the place of the earliest generations of fans and especially the Fair Use Act in creating an environment where this writer could say such things:
"[The panel] was a bunch of writers who had mostly gotten their start in 1970s K/S and had mostly transitioned to being profic writers. When they were sharing fandom stories from back in the day, the panel was great. When they were talking about their approach to fanfic and its relationship to canon, TPTB, profic, and tie-ins, they were so far on the other side of a cultural and to some degree generational divide from me that it wasn't even worth the time and effort to argue with them.
...They believed that the reason they could write Trekfic was because Paramount let them/turned a blind eye, and they believed that when Paramount started recruiting fic writers to write tie-in novels, that amounted to Paramount finally paying attention to the fandom. I don't think they could have possibly understood the relationship I have with TPTB in my fandoms, that I don't care whether or not they want me to be writing the fic, that I often write fic that would be read as deliberately confrontational toward TPTB, except that I don't give a shit whether they read it because I'm writing in conversation with other fans, not in conversation with the creators. They can't comprehend how I approach contemporary copyright law as a thing to ignore when one is not politically inspired and to campaign against when one is."
Visibility and the Internet Makes Everything More ComplicatedFrom a 2002 blog post:
Fanfic is also dangerously illegal. When the stuff was distributed the old-school way, in xeroxed pamphlets at S.F. conventions, it was harder for companies to crack down on it. Now that most fanfic is on the Web, however, bored attorneys can do a Google search and come up with 16 potential lawsuits in 10 minutes. 
- from Sue Clerc in Rallying Call #18
- from Southern Enclave #12
- from S and H #7
- from Southern Enclave #39
- Chelsea Quinn Yarbro, "A Willful Case of Copyright Infringement", SFWA Bulletin (Summer 1992), 11-14.
- Chelsea Quinn Yarbro, "Copyright Infringement Part II", SFWA Bulletin (Fall 1992), 19-20.
- How Yarbro could claim that inclusion of a historical person in a story was copyright infringement has yet to be determined.
- FanWorks Inc. Fan Fiction Policies: Chelsea Quinn Yarbro (accessed 13 March 2010)
- Jim C. Hines, comment by djonn, May 26, 2010
- "One index finger on the mouse scroll bar and the other on my clit": slash writers' views on pornography, censorship, feminism and risk (2001)
- from a fan reviewing Delta Quadrant of Venus in Now Voyager
- from Pop Stand Express #4
- from Trexperts #37
- Datazine #36
- from My Life in Fandom, Deb Walsh, accessed 7.5.2011
- from an ad for Dirtball Dispatch, a Starsky & Hutch zine
- from Multi-Species Medicine #20
- from Details at 11 #12 (1986)
- Regarding Chad Kennedy at The Fandom Debunker, October 23, 2013.
- Alyssa Rosenberg, Steven Moffat on Sherlock’s Return, the Holmes-Watson Love Story, and Updating the First Supervillain. May 7, 2012.
- That's exactly how it was.
- Philcon convention report dated Nov. 11th, 2013; reference link. The panel in question consisted of D.L. Carter, Kathy Sands, Roberta Rogow, Peter Prellwitz and April Grey.
- Fanfic of the Damned: I like to play a little game when online to avoid working; it's called "find the weirdest fanfic."; WebCite, by Annalee Newitz, June 4, 2002