The idea I like it, though I add my game friends to FB gaming profile, if close they add to my RL profile, I have tons on Skype.
I can remember details of probably about 400 friends (I was even tested lol and list read thru while my bud double clicked their profiles and verified what I "knew" about them. I know where I met them, which group they share with me, what game or place, their relationship status, general age group(exact if close and known more than a year). I get fuzzy on real names of many. Its funny since a good 1/3 were like around 8 sometimes and they are now adults and teens. Amazing even.
They start as more general adds like guild/group/faction. My old faction server has a who's online light ( I am not there because ...meh. But none of my friends play there anymore)