[tejaswiy]

Their "Close friends" algorithm does a pretty good job already. And even if it doesn't I'm sure most people have already removed / added friends as appropriate from that circle.

Facebook also has a bunch of data on how often you've interacted with various friends there .. so that could be one data point. (How often you're tagged in a check-in / photo, how often you've liked a post made by someone else etc.)

Your Your mom / dad / school friends generally may not be a good data point, while your college friends might be.

It'll take a lot of beta testing and tweaking, but I think it can be done.