Any ad network is susceptible to this sort of fraud. A group from China managed to amass large sums from Google ads until they were caught and shut down a year or two back (Techcrunch ran an article about this). I am sure there are some that still manage to do it successfully. The true value of a click is one that is quantifiable beyond likes. * How many users signed up because of the click with a valid email ? Captchas / honeypots can be used to filter spammers. * Of these users that signed up, how many are active ? * How many users bought the product as a result of the click ? etc You many need to drill down deeper to avoid some layers of spam users. But yeah, the way the value is measured should not stop with how many users 'liked' a product. It needs to go deeper.