Looks like Facebook has just added Google Adsense and a few other ad networks with 160x600 and 250x300 spammy ads
Facebook never used Google Ads You installed a Google chrome or FF extension. Some extensions replace Facebook Ads with they own Ads Browse Facebook with another browser and you'll see the results.
You definitely have a browser addon doing that. Why would Facebook use their competition's ad network?
Yeah facebook pages are full of ads but fortunately, it has not been bothering me. I haven't notice any ad on the lower left side of my profile page like the one above. What has been bothering me are the spam links that are being posted on my wall. *sigh*