A couple who insist on having long sappy conversations on twitter to the annoyance of all who follow them
Jonh: I love you Heather! <3
Heather: I love you more John! <3
Me: Freaking Tweethearts, Will you just get a damn MSN convo already.
by Dr Simon Love February 17, 2010
Commonly used to address your followers on Twitter.
Good morning all you tweethearts! Had breakfast with the wifey. It was amazeballs!
by Frara P. July 28, 2009
A person that does a great job tweeting via twitter.

Someone who uses twitter a lot.
by JunkyRhythm April 3, 2009
1. A person who is much loved in Twitter
2. A sweetie or any well-liked individual in Twitter
She is the tweetheart of my life.
by timlight January 30, 2010
"Twitter sweetheart" which is a step down from "Craigslist whore-friend" and is probably not something that should exist, but apparently it does exist. See Twivorce.
I can't believe what that tweetheart thinks she'll get away with what she's tweeting.
by hyperbole and a half December 12, 2011
a single person who seeks friendship and love from some other person on Twitter.
She is a tweetheart. She is looking for a like-minded person on Twitter.
by uttam maharjan November 16, 2010