(usually derogatory) A group of Twitter users targetting an issue or individual, especially one that forms suddenly and is viewed as hostile.

plural of Twitterbot

A program used to produce automated posts on the microblogging service Twitter; by extension, a Twitter account featuring posts produced by such a program.

(Internet) The totality of users and messages on the Twitter microblogging service.

(Internet slang) The world or sphere of Twitter (the microblogging service).

Alternative form of Twitterati

Characterised or marked by twittering

(informal) Adaptation to the norms and values of the (users of) the social network Twitter.

(Internet slang, literature) Literary use of the microblogging service Twitter, especially in the form of aphorisms, poetry, and fiction.