I did some testing with Facebook ads and resulting Facebook likes on target pages. And something is wrong! Just after creating the ad, before the ad was approved, I could get many likes on the target page without even seeing any traffic on server logs or google analytics. I documented my tests in this presentation. I repeated the tests 6 times, every time I could get tens of likes on the target page within seconds and without any approval of the ad. These pages have little traffic and there's no way these likes could have been natural! Everyone I reported was able to reproduce it, try yourself.