What does MT mean in a tweet?

Technical Twitter abbreviations:

• MT = Modified tweet. This means the tweet you're looking at is a paraphrase of a tweet originally written by someone else.
• RT = Retweet. The tweet you're looking at was forwarded to you by another user.
• DM = Direct message. A direct-message is a message only you and the person who sent it can read. IMPORTANT: To DM someone all you need to type is D username message.
• PRT = Partial retweet. The tweet you're looking at is the truncated version of someone else's tweet.
• HT = Hat tip. This is a way of attributing a link to another Twitter user.
• CC = Carbon-copy. Works the same way as email.

Read more: http://articles.businessinsider.com/2010-08-02/tech/30060587_1_tweet-abbreviations-twitter-user#ixzz1dbkio2bk