Saftiges Gnu: In social networks there is a little space for the privacy. Of course you can chanche your options so only friends could see your photos or posts but there are some gaps. For example Whats App has a good solution when it comes to being able to delete my own time stamp at least. It‘s a matter of fact that on Facebook, I cannot decide whether I want my chat partner to know WHEN I read his messages or not. By seeing my time stamp (opening his message - whether I read it or not) he can conclude that I was online.