I'm not sure how I feel about content being tailored based on my social graph's likes. In some cases it could be good, in others not so much. My friends list on facebook has enough of people from my small town high school days thanks to our upcoming 10 year reunion, and believe me -- we have nothing in common. Maybe I'm being cynical but I loved the internet when you sought new and exciting things without the group think.
I've been thinking along similar lines lately. I only care about what a few of my Facebook 'friends' like, think, do, etc., and I talk to them in real life. If it weren't for the social noise that is Facebook, I think I would have made a few more meaningful relationships like that in college. Friendship has been hijacked by acquaintanceship.
I was just talking about this with my friends. It really needs to integrate with friend lists in some way. Ideally, there would be a way to "devalue" a friend so their activity isn't as highly valued as other friends you have. Even more ideally, this information could be filtered automatically through a learning algorithm that increases the value of recommendations from friends you match closely. That would avoid a UI nightmare of trying to get everyone on Facebook to basically rank their friends in terms of value of their opinions.
The algorithm would need to be pretty smart though, for example I have friends who I'd trust to the end's of the earth on everything except for music, we have violently different tastes and no ability to recommend music to each other.
It will be super easy for facebook to make the distinction between all your fb friends and the special friends you care/share things with. They already do this for the newsfeed.
Indeed it would be if there was a value associated to a filter, as it stands it's just a filter with an ambiguous name. I do wish the filters were easier to use, at least accessible with one click instead of buried away.