As an experiment, I recently ran two advertising campaigns on Facebook - one used Flyers Basic (CPC) and the second used Flyers Pro (CPM). If you are wondering how effective are Facebook ads in terms of clicks, here are the results:
1. Facebook Flyers Basic - They cost $5 to display your ad 2,500 times on various Facebook pages. I bought 5,000 ad impressions on Facebook and here's what Google Analytics has to say about the number of clicks received from Facebook - Total Visits = 5
[Facebook won't share the click-through-rate for Flyers Basic version]
2. Facebook Flyers Pro - This is a CPC ad program of Facebook where you pay only for the clicks. Flyers Pro The ads made around 800 impressions on Facebook and the number of visitor clicks received was five (CTR = 0.6%).
Though the above advertising campaigns on Facebook were run for a very short period, they do indicate that the click through rates for ads appearing on Facebook can be extremely low.
Sidenote: If you are located outside US, you can make the payment for Facebook Flyers via International Credit Cards but not PayPal. The Payment page for Flyers looks as if it won't accept non-US credit cards but just type your full address and it will work just fine.