A person who is somewhat indiscriminate in the number or type of people the follow on Twitter
Mikey: "What is that '300' on the screen of your phone?"
Bruce: "Oh, that's the number of tweets that have arrived in the past 2 hours since you've been using my phone."
Mikey: "So many?"
Bruce: "I'm quite indiscriminate about who I follow."
Mikey: "You're such a Twitter whore".