http://blog.imranghory.org/facebook-ads-the-cheapest-traffic-youll-ever
Interesting article about how effective facebook ads can be with some optimisation. Cost per clicks between a few pence and .3p per click. Food for thought. No specific advice or tips in the article.
http://www.widgetbucks.com/
WidgetBucks offer "richer" ads which you can embed in content sites and blogs. They aim to deliver higher CPMs in the region of $2 - $6 CPM.
