Hello, It is a bad idea to start new site or blog with little traffic and to put adsense there while you are using traffic from Facebook fan pages with links into this site. I mean the risk of ban is enormous. Last month I know few guys who were banned without clear reason, but their main traffic was from Facebook pages. So when you get traffic only from google it is safe to put adsense. Be careful with using traffic from FB or other socials at the beginning of your new site/blog!