Twitter will become a noun and verb in the next Collins English Dictionary. The definitions have to do with Twitter's micro blogging service and is an indication of just how popular and mainstream the site has become.
"Twitter ... will be added to the next edition of the Collins English Dictionary.
According to The Telegraph, Twitter the noun will be defined as “a website where people can post short messages about their current activities” while the verb’s definition will be “to write short messages on the Twitter website.” Interestingly, the term “tweet” doesn’t appear to be included (as it now is in the AP Stylebook), but Twitterati and Twitterverse will be.
Rival dictionary Merriam-Webster, for what it’s worth, still defines Twitter the verb as “to utter successive chirping noises” and the noun as “a small tremulous intermittent sound.” Perhaps the company is saving Twitter (Twitter) for “word of the year” status, as the word “blog” was back in 2004."