How do you write it?

Thanks for clearing up the confusion, AP Stylebook folks!

As some of my coworkers can attest (shout out to @simpliciano!), I’m a huge fan of learning the AP Style way. Spreading the enthusiasm, I’d like to share a note that just came into my inbox. : )

An AP Stylebook Online entry has been updated.
Editor’s Note: The Twitter entry has been corrected to say that to tweet as a verb and a tweet as a noun should be lowercase.
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Twitter
A community-based message-distribution system that allows users to post continual status updates of up to 140 characters detailing their activities for followers. The verb is to Twitter or to tweet. A Twitter message is known as a tweet.