|See also:||pseudonym, anonymouse, sockpuppet, Reviewers with Pseuds|
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Like other humans, some fans choose to communicate without revealing their identity under certain circumstances.
Anonymity on the Internet
Some fans are more or less open about their real names, but most use pseuds to participate in fandom, creating a consistent and permanent identity that develops a history and reputation over time. 
Being anonymous is different from being pseudonymous, although culture clash can occur when media fans interact with groups who don't understand the difference. (See Racefail 09 in the Controversies section.)
Many exchange-based ficathons or challenges have a period of time where works are posted anonymously before authors/creators are revealed.
Kink memes are often anonymous, although if a story or artwork becomes popular, the creator is often requested by commenters to "de-anon" and post her story in a more permanent location. (See Until the Pieces Fit for an example of a widely acclaimed Merlin story whose author decided to remain permanently anon, and her reasons for doing so.) This happens more often if the story is quite long, as journalling sites like Livejournal have strict comment length limits; comment threading can make re-reading a longer story posted on a kink meme quite inconvenient.
In Zine Fandom
The desire for total anonymity long predates online fandom. Fans could get published anonymously in zines, depending on the zine editor's policy, and print publications could even be distributed without attribution. For example, With Malice Aforethought was a proposed 1980s letterzine meant to showcase anonymous opinions. NOT The MediaWest*Con Program Guides was a parodic anonymous pamphlet left on the freebie table at MediaWest*Con every year starting in 1988.
The reviewer for Datazine in 1980 was a pseudonym, Tigriffin. Referring to herself in the third person, she defended anonymous reviews: "Tigriffin also believes that reviewers who hide behind their pseudonyms to give their nastiness free rein aren't playing fair. So let it be shown on the record that Tigiffin only wishes to remain anonymous so that it can review impartially and remain unaccused of favoritism to friends or undue harshness to non-friends."
Some media fanzine readers doubted the value of anonymous writing. In a 1989 letter printed in On the Double #10, a fan expressed her displeasure, and fear, of the possibility of a LoC zine where fans sent in letters, but did not sign their names.
I have heard a rumor of a new letterzine that will specialize in letters of comment, but I have heard that these letters will be "anonymous". If the person writing the letter doesn't have the chutzpah to put their name to the thing, how valid can it really be? I also can't help feeling that "anonymous" letters that appear in print will eventually hurt somebody somewhere, and my plea to whomever is doing the zine is to consider your options very carefully. I think you'll find that most Trekfans are brave enough to say what they think without having to duck behind a veil of anonymity.
The letterzine in question was probably The LOC Connection, which had a policy for its first four issues of printing LoCs anonymously. Some reactions to this policy were very similar to more recent arguments made against online anonymity.
- RaceFail '09 showcased persistent refusal to understand the difference between anonymity and pseudonymity
- Bandflesh, a popular anon meme in bandom
- And that's the difference between LiveJournal et al fandom and any social network community, because the more invested I become with the identity I have within this community, the more invested I become with the community itself. Because to lose this community would mean to lose my identity, not to mention, because of how fandom works, it would also mean losing the friends and the people that makes this community. This identity exists because of this community essentially. Wistfuljane, On bandflesh and anonymity in fandom, posted June 10, 2008. Last accessed October 05, 2010.
- There are completely innocent reasons why someone might want to post on lj anonymously - embarrassment about a sensitive topic, fear of revealing personal details that could allow someone to connect her/his online persona with an offline face and name, a desire to do a good deed without making a big deal about it - I could go on, but I'm sure all of us can think of examples of benevolent anonymity. Fabu, The perils of anonymity, posted June 11, 2008. Last accessed October 05, 2010.
- You can take important personal risks. You can talk about the ways in which your life is collapsing around you even if you, like me, are absolutely terrified of confessing weakness. .... You can take trivial personal risks. You can talk in loving detail about your bowel movements and ask that question you've always wondered about your labia. Kalpurna, TRUE CONFESSIONS, posted June 10, 2008. Last accessed October 05, 2010.
- The only reason to be hateful or to attack someone else anonymously is to escape whatever consequences might be associated with that attack - perhaps people will defriend you for viciousness, perhaps people will no longer trust you with their confidences if they discover that it was you who revealed flocked or other personal information, etc. All the explanations given for anonymous hating (not other kinds of anonymous posting, but specifically anonymous hate memes and the like) -- "the bnfs will hate on me," "the minions will attack me," "it frees me from social conventions so that I can share my real opinions," etc. -- can be translated into one simple fact: anonymous hating is a way to be cruel without having to own up to your actions/words. Fabu, The perils of anonymity, posted June 11, 2008. Last accessed October 05, 2010.
- Datazine #4. May/July 1980. Quoted in Boldly Writing, p. 48.