It seems to me they could have supported lists better. I created a bunch of lists and try to make sure everyone is in the correct list, but most of my FB browsing is now through the iPhone app, which doesn't prompt me about this stuff. It always felt like they did just enough to have a decent implementation of it, but it never really got as integrated as it needed to be.

If it's a feature that isn't used as often as they hoped, it's likely because (a) their support for this feature is lacking, and (b) they haven't educated users about this feature.

Both of these points weren't surprising to me because I always believed that FB wants people to share as much about themselves to as many people as possible.

I think without Google Me, and perhaps frid.ge, they would never have reconsidered these concerns.