ちまたで話題の Twitter を提供する Twitter 社は、「 Tweets 」の商標の登録申請をしたそうです。Tweets という言葉が招くかもしれないトラブルなどに備えるためのようです。また、申請したからといって制限をかけるつもりもないということです。
The ecosystem growing around Twitter is something we very much believe in nourishing and supporting. There are lots of really awesome services and applications out there like TweetDeck, TweetMeme, Tweetie, BackTweets, Tweetboard, and others that we absolutely love as do many users. However, as the ecosystem grows there is also the possibility that confusing and potentially damaging projects could emerge.