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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. Celebrities and people involved in various media industries also post to Twitter. The boundaries between fans and celebrities are blurred, as Twitter allows for direct interaction. This can sometimes have negative consequences as celebrities say offensive or ignorant things, or fans cross boundaries by posting links to fanfic, etc.
The day's tweets can be cross-posted to LJ, which some people find deeply annoying.