I need some help! Lately, I've been getting a vile pop up. Its far beyond any other ad I've encountered on the web. Appearing randomly, in the sidebars and ad spaces of completely innocuous websites, is an ad which says 'sl*ts of facebook', or some other offensive message, but always referring to facebook. In every ad is an uncensored image of a completely naked woman. I don't know is there's some virus on my computer; I've tried running spybot several times, with no result. If any other FReeper has faced such a problem, and/or knows how to stop it from...