How many companies advertise on Tumblr or Digg? They continue to exist but are not seen as the next bastion of advertising. How will they target well when the p

How many companies advertise on Tumblr or Digg? They continue to exist but are not seen as the next bastion of advertising. How will they target well when the platform is a cesspool? Sure they'll get impressions but not the clicks. Fewer celebrities will want to hang out on Twitter if anyone can easily impersonate them or if they don't have people at Twitter to give them white glove service.