We had a similar level of traction adverstising nametoolkit.com (shameless plug but we all do it on HN). The visitors we got from Facebook seemed completely lo

We had a similar level of traction adverstising nametoolkit.com (shameless plug but we all do it on HN). The visitors we got from Facebook seemed completely lost, but yet the cost per click (CPC) we ended up paying was notably higher than the CPC from adwords. We tried Bing also, and they were really great at customer service; some guy talked to me for over an hour about various things we could try and they always got back quickly, but the CPCs were absurdly high.