Cryptic have already confirmed that Twitter will be included in Champions Online, and now Blizzard reveal that a fully functioning Twitter client is live in World of Warcraft now.

Called TweetCraft, a full, in-game take on Twitter is promised.

The new service will allow the sending and receiving of in-game 'Tweets', the uploading of in-game screen grabs via TwitPic, auto log-in for collecting messages - and even auto-tweeting linked to in-game events.