La Russa v. Twitter, Inc. [1]

Anthony La Russa, manager of the St. Louis Cardinals, sued Twitter [2] after an unknown Twitter user created an account at twitter.com/TonyLaRussa and pretended to post updates as La Russa. The fake Twitter page included La Russa's photo and a handful of vulgar and apparently Cardinals-related updates. One line of the "profile" suggested it was all a fake: "Bio Parodies are fun for everyone."

La Russa's complaint alleged that the fake Twitter page constituted trademark infringement and dilution, cybersquatting, and misappropriation of name and likeness.  According to the San Francisco Chronicle [3], La Russa's attorney tried to contact Twitter before filing the lawsuit, but got no response. Hours after the lawsuit was filed, Twitter removed the fake La Russa page and its postings. 

UPDATE: 

6/5/2009 - Twitter removed the case to the United States District Court for the Northern District of California.  STLToday.com reported [4] that the parties had settled, citing La Russa as the source of the information.

6/6/2009 - Twitter denied [5] reports that it had settled the lawsuit.

6/26/09 - La Russa filed a notice of voluntary dismissal [6] after the parties settled the case.