Facebook's Ad Plans: Tackling Google Head-On

There's news that Facebook is releasing a new version of its Ad Conversion tool for advertisers to see how well their placements are going. Interesting stuff, if you're an advertiser. But the back story is huge: Facebook is tackling Google.

Basically Facebook is enabling its advertising partners to get the detailed low-down on the return on investment they're getting from ad placements on Facebook--the tool allows you to "track activity that happens on your Web site as a result of someone...