Facebook: challenge your friends...publicly?

Facebook is cool! You just hang around, find friends you have not seen for years, everyone leaves happily in the better world!
That was my first impression with Facebook. When you have found everyone you had lost, what do you do? Nothing?
WRONG!
If you are on Facebook, one of your friends should try to turn you into a vampire, a zombie a werewolf or a slayer! OK, right here, as a newbie you think for yourself: fine, I found him and he turned me into a Vampire... Friendship on Facebook is not as friendly in real life.
And then you try to earn points to become a really nasty Vampire, with an army of vampires, and you try to beat your friends. Starting a war on any subject, a competition on every single issue. Dealing with virtual living deads is OK, but I feel somewhat unhappy with some other tests: likeness or worse the IQ test!
What is it for?? Passing an IQ test in English on Facebook, is not very interesting, especially since English is not my mother tongue, I managed to score well, but felt disgusted because it looked like an old competition I did not have since primary school.
How social is it to walk in the city with everyone wearing a tee shirt displaying he IQ score??
Facebook, and globally "social networks" are missing something important: social networking is not about exhibitionism, you shoud be able to share your information relatively to the level of trust, confidence you have with the others: I don't want someone to be able to find me through my IQ score: what if someone you don't know tells you "He you, you are as stupid as my cat!" or worse "I want to be your friend because my IQ is lower, and you should be able to give me good advices!".
Come on, shame on this!
Societies are far more complex: human interactions are made from what we say, and more important: what we don't say!
Friends or not friend, is not enough!
Even if people were able to make groups, that would not be enough: some people should be able to earn the right to get access to your information, even if you don't know them, while some of your friends should not be able to learn too much about you!
I would like a self organizing social network, anyway the social network itself should be evaluated:

is it really a friend to you?