Indeed, whats the point of having so many contacts if you only speak to 10 of them and it is exactly the same on facebook.
Where as on facebook people compete on "who has the most friends" when they only add people they know and not what they speak to.
But the point with facebook isn't to "chitty-chat" as MSN.
The point with facebook is to keep in touch - as in you add your high-school friends and then a year later you can find them easy for a reunion. It's tons easier to add people on facebook, keep track on how they're doing and stuff.
I have around 600friends. I know all of them in person (apart from some MH dudes and enis lol) but I have never competed or tried to have more friends than someone else. It's just a way for me to keep track on people. I have different groups for them such as old classmates, acquaintances, friends from south africa, etc.
The "add people they know and not the ones they speak to", well for me it's a matter of "if". As in, I have a friend in another town, I add him, but I don't speak daily. Its because if I'm visiting that town or if I'm going to be close to that town I'll poke him/her and I meet up instead. I always have a purpose for adding someone.
At least it's my pov on the whole...
And yes, Twilight is bad. Apart from one of Edwards sisters, she's hot! The one with the dark short hair. Oooh /drool