Most celebrities live with the constant reminder that their claims to fame could expire at any time. For instance, as social media brings more Justin Biebers into the world, you may find yourself wondering, "What ever happened to that first guy?"
These days, a huge following on social media is one of the most valuable marketing advantages a person can have -- just ask Louis C.K. or Conan O' Brien.
Other celebrities use social media to break away from old characters. Many of the actors from Star Trek have moved past the U.S.S. Enterprise to engage with new fans, many of whom may not feel connected to the classic franchise at all (gasp).
Whether it's utilizing followers to pursue opportunity or transforming a famous role into advocacy, these celebrities have successfully reinvented themselves on social media.