To be a superstar is one thing, but to be a superstar on the social networking scale is quite another. According to
Forbes,
Rihanna is leading the pack in that area, while
Lady Gaga closes in closely behind her. Both women have used their social media presence to give fans an inside glimpse into their everyday lives. Whether it's
Rihanna sharing her private, personal thoughts or Gaga posting exclusive pics, their networks leave ...