Question...has anyone noticed if this relationship is reciprocal? I keep an eye on my Gmail ads to see how far along they track my activity while I am logged in and browsing, but has anyone noticed Gmail ads showing content that wouldn't be there without placement or data from Facebook? Obviously this doesn't apply if you sandbox Facebook as some commenters have, but if you use both in one browser I mean. I may use Firebug and see if the two communicate while I'm logged in...