Many people lament the day Facebook opened its doors to non-students. Ehssan Dariani and Dennis Bemmann decided to build a social network that would remain open only to enrolled in school. Since its launch in 2005, StudiVZ has grown into the one of the most popular and visited social networks in Europe with 16 million users. A lot of features found in Facebook, like Poking, are also found in StudiVZ. Co-founder and CEO Dariani has not hidden then fact that Facebook was his inspiration and model, saying: "We may have oriented ourselves along the lines of the Facebook layout. But it was also clear from the get-go that we would strongly distinguish ourselves by other things, that we wanted to be original."