This is ridiculous. On Nov 21st 2008 a representative from Twitter said this,

"There are certainly many applications out there that include Twitter as part of their name, but we prefer that you not do so. Twit, Tweet etc. are all fine."

http://74.125.95.132/search?q=cache:SGqicWFJttIJ:groups.goog...

Many people, myself included, acted upon this information in good faith (and in my case at a monetary cost for a domain name containing the word "tweet").

Does this public pronouncement affect their legal standing when it comes to defending the trademark "tweet"?

Edit: Should I continue with this? http://news.ycombinator.com/item?id=677643