Facebook to clamp down on who can cash in on ads. http://www.reuters.com/article/us-advertising-dmexco-facebook/facebook-to-clamp-down-on-who-can-cash-in-on-ads-idUSKCN1BO1ON?utm_campaign=trueAnthem:+Trending+Content&utm_content=59b9828a04d301030b6edc05&utm_medium=trueAnthem&utm_source=twitter