Tumblr users spend an average of 14 minutes per visit, Tumblr founder and CEO David Karp revealed… The reason for the longer session time is not that Tumblr is ‘so much better,’ Karp explained. ‘It’s very different behavior. People come here for same reason they turn their TV on when they come home at the end of the day … It’s something to do before checking your email, it’s a chance to go and see stuff you enjoy, let’s you escape from the real world. And that media experience is one that ends up consuming a fair bit more time than just the amount of time you spend checking your friends updates on Facebook or Twitter or Foursquare.’