What is the value of a celebrity re-tweet? CNBC's Darren Rovell reports it's called TwitChange. Celebs are donating the proceeds to charities. They may re-tweet a message or even post if for up to a month. Here are what a few celeb re-tweets are worth: UFC's Dana White $6,000 Justin Bieber $2,... Read More... Don't Miss Any Updates! News Directly in Your Inbox Subscribe to: