Oxford Advanced American Dictionary

Definition of twitter verb from the Oxford Advanced Learner's Dictionary

twitter

verb
twitter pronunciation English ˈtwɪtə(r) twitter pronunciation American ˈtwɪtər
 
1 (also tweet) [intransitive] when birds twitter, they make a series of short high sounds2 [intransitive, transitive] twitter (on) (about something)| + speech (especially British English) to talk quickly in a high excited voice, especially about something that is not very important3 (also tweet) [intransitive] to send a message using the Twitter social networking serviceSome members of Congress twittered through the President's big speech.