koan - 3:30 am on May 5, 2011 (gmt 0)
People do not go to facebook to click on ads and shop, they go to play games or social network. I would venture to say most users do not even look at the ads.
You could say the same about TV, radio, newspapers, yet ads still work on those mediums, from the big corporation wanting to raise awareness about a product and build a national brand, to the used car salesman promoting his week-end special in the local newspaper. It's not always about a click and instant conversion.