tweetheart

noun

a) A user who is popular and well-regarded by others.

When Vanity Fair published a story earlier this year on a group of all-American, all-white "tweethearts," the real Twitterati took the magazine to task for ignoring a growing force on Twitter: African-Americans.

b) A user who is ones personal friend or within ones broader social networking circle.

"I liked the idea of people who dont really know each other except through short messages getting together and meeting for the first time, putting a face to a name, and also telling people how much I enjoy reading their updates," said Tim Lara, Twitter user \@timothydanger. "Meeting new tweeps was nice too. I gained a couple of tweethearts since then and enjoy the banter. (My twitter is never serious)."