I can tell that i haven't many experience about social network. But i joined to this site over year ago so i have little more experiences than you. Before i have used only facebook little time..but i dont't like it very much..i prefer call to my friend than write to facebook.
What about interpals? I have enjoyed this site. I have met many interesting people in different countries. And my English has become little better. My speaking is still bad but writing better.
I haven't any bad saying about people on this site. Sometimes somebody ask money or sent many such message which i didn't enjoy..but this is good settings in this site..you can block such users messages. Maybe this is only women's problem..i think that here are also worst men..
Sometimes i thought that is it safe to give information here..but i haven't exact information about that.