Since Tweets are limited to 140 characters, a shorthand language has evolved for Twitter. These are some of the common abbreviations you may see in Tweets.
RT (or R/T) is used to denote that a Tweet has been retweeted. It may be at the start of a Tweet, or it may come later if someone has added their own text to the start of the Tweet:
MT: Modified Tweet
Similar to RT, MT indicates that a Tweet has been retweeted. However, it also denotes that the original Tweet was modified – usually to save characters to add thoughts or opinions. Some meaning may have been lost in the editing so it is worth checking what the original Tweet said.
HT or H/T: Hat Tip
When you want to acknowledge someone for providing inspiration for a Tweet, or crediting them in your Tweet, use HT followed by their @username. This means that you don’t take the credit for something that you didn’t do.
Via may sometimes be used instead or RT or HT to show the original source of a Tweet or idea.