Tweet

A twitter update

Tweeple

Twitter users

Tweetup

A meeting for Tweeple

TwitPic

A service that lets you upload photos to be shared on Twitter

RT

Re-Tweet. To forward someone’s interesting tweet to your followers

@

(prefix) Use to indicate a reply to or a mention of a particular username

#

Add # before keywords in your tweet so it gets picked up in Twitter Trend searches