A person who feels the need to constantly share and retweet the tweets of someone else. Typically these retweets are irrelevant and clog up your twitter feed.
"Oh, new tweet!"
"TFLN: (513) she couldn't hear you, she had her legs covering her ears retweeted by kathy"
"TFLN: (641) she had a corn cob in her bed
(641) Don't make me say it
Retweeted by kathy"
.... 30 TFLN retweets later....
"God damn it Kathy you retweet whore!"