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The significance of this is that journalists now have an official way that they should – if they’re following the Stylebook - refer to the microblogging service in any articles that mention the service. So how does The Associated Press define proper Twitter usage, and what new ammunition do grammar trolls have for assailing would-be Twitter commentators?
According to the Stylebook, Twitter the noun refers to a “social networking Web site limits messages to short Tweets.” If you’re using Twitter as a verb, both “to Twitter” and “to Tweet” are acceptable. For example, “I’m going to tweet that” is proper grammar, while “I'm using the Twitter!” would be a suspect style choice.