In 2008 studiVZ was sued by Facebook. They said we theft their PHP, CSS/JS "code". (http://techcrunch.com/2008/07/18/facebook-sues-german-social...).
Indeed, the first version of studiVZ was inspired by Facebook. Our founder had seen FB in 2005 the first time in the US, but it wasn't possible to use the service without a .edu eMail account. That was the decision to make a local clone.
But the real story behind the lawsuit is a bit longer. In december 2006 Facebook tried to acquire studiVZ the very first time.
This picture with two of the studiVZ founder and some people from FB's management team is from this time:
http://img-a4.pe.imagevz.net/photo3/f3/9a/ce37499d84437cb744...
But FB hadn't the amount of cash to aquire the company. The Holtzbrinck Publishing Group aquired studiVZ later for 85 mio. €
In 2008 (before the lawsuit) FB tried the second time to acquire studiVZ - this time for 4,8% of shares! But this deal didn't happend - unfortunately.