I don't use Facebook. Incidentally, I adblocked "facebook.com" the other day, and a lot of sites load much faster now. In three days, the rule has been hit over 1300 times! If I had a Facebook account, this would scare me.
I use Facebook, so blocking it won't work for me. But I don't want other sites to be able to "cross-domain" Facebook, since that gives Facebook more information that I'd like. A way to block only "cross-domain" type Facebook access would be nice. Or perhaps a per-tab private browsing mode.
||facebook.com^$third-party