Twitter Acronyms and Language: Essential Guide from The Next Web

Twitter Symbols

@ - Twitter address symbol, e.g. @law_pundit
# - hashtag, groups all identically hashtagged Tweets by topic, e.g. #law or #patents
RT - retweet RT@law_pundit
MT - modified Tweet MT@law_pundit
DM - direct message (only between reciprocal followers)

Twitter Vocabulary

This. - Refers to a must-click like This. RT@law_pundit
OH - overheard e.g. OH at @law_pundit

There are more....

For the full article, see The Next Web at Our Guide to Twitter's Language