Amit Agarwal of Digital Inspirations recently ran two ad campains on Facebook and had a bad experience. Amit purchased 5,000 ad impressions for 10$ on Flyers Basic of Facebook advertising system. And for his surprise he was able to get only 5 visits to his site from that ad campaign.
Observing his bad experience on Facebook advertising I feel it is better to stick to Google AdWords. For Indian content blogs I prefer to run ad campaigns on indianpad, the Indian version of famous DIgg.
Seems to be Google sensed that there is not much threat from Facebook and their bidding for Facebook share was less compared to Microsoft(Microsoft is the highest bidder for Facebook share and the deal is through) .
Read full story of Amit in his blog post.