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Twitter is a popular "real time information network" that enjoys worldwide popularity.
- At the heart of Twitter are small bursts of information called Tweets. Each Tweet is 140 characters in length, but don’t let the small size fool you—you can share a lot with a little space. 
Fans use Twitter to keep in contact with one another. Numerous celebrities and people involved in various media industries also post to Twitter, making the boundaries between fans and celebrities blurred, as Twitter allows for direct interaction.
The day's tweets can be cross-posted to LJ, which some people find deeply annoying.
Use Among Fans
The 140-character limit makes it so that most fans use Twitter for more casual conversation that they feel don't belong on their main tumblr or journal. Often, ideas for meta and fanfiction first brought up on Twitter will then be expanded and polished and be posted on the fan's main website. Collaborative headcanons, notfic (which can then develop into a proper story) and general brainstorming is common on Twitter. Tumblr-based users may also find it useful to have a locked Twitter to use for rl updates they wish to share only with a selected group of people.
Given the nature of Twitter as a site where parody accounts of celebrities abound, this has extended to fandom too, in this case including characters.
Fans & Celebrities
Direct interaction can sometimes have negative consequences as celebrities say offensive or ignorant things, or fans cross boundaries by posting links to fanfic.
Common Twitter Terms
- lrt: short for last retweet. A tweet preceded by this abbreviation is intended as a reaction to what the user has just retweeted.
- t-list: the people someone follows on Twitter.
- About Twitter (Accessed Sept. 25, 2011)
- for example the Twitter RP group Cumberholmes
- examples: HarriedWizzard, John Marcone, JohnMarcone, sgtkarrinmurphy, mouse_the_dog, WardenSexypants, PadawanMolly, SigrunGard, DonarVadderung, Toot Toot, Godmother_Leah, Hellhound4Hire, BlackstaffMcCoy et al.
- See for example Emo Kylo Ren