Twitter! At least, according to The Global Language Monitor, it is. The GLM "documents, analyzes and tracks trends in language the world over, with a particular emphasis upon Global English," and this year proclaimed "Twitter" the Top Word of 2009 after a worldwide survey of the English language. Other popular words: "Obama," "H1N1," and "Vampires." (Hmm, I wonder where that one came from?)
Screenwriter Roger Avary, most known for co-writing Pulp Fiction with Quentin Tarantino, is serving a yearlong sentence in a California jail for vehicular manslaughter, but was released during working hours five days a week on a work release program. Allegedly, he was using the popular social networking site to post details about life in prison. However, in California prisoners are forbidden to access the Internet during the period of incarceration, and Avary was caught a few months after he started tweeting. Since then, he's back in regular confinement, and the account has been changed to private.
Twitter is clearly hot right now, as more celebrities and companies jump on the social networking bandwagon.