three people have been banned for just using facebook. Too risky even if you can. Don't tell friends about your site, that is the other one that gets you banned. Don't use adwords if your using adsense, probably get banned or click bombed.
I discovered that some people will just come and say anything they like on this forum, what concerns Google if you advertise on facebook. you can get traffic from facebook without clicks and you can also get clicks that are not converting and google won't pay. I have never heard that people advertising on facebook get banned. Its not in their TOS
From Google Adsense support forum People are not banned for using facebook. I use facebook, and have for a long time. I'm not banned. It isn't about using facebook...it's about HOW you use facebook. If you join the infamous click rings on facebook, that will certainly get your account disabled. I've reported massive click-rings from facebook (over 600 members), and people who are members of those or take part in the "you click mine, I'll click yours" groups get disabled - so the people who were disabled from facebook were likely involved in something they shouldn't have been involved in. There's no problem with putting a link to your site on your facebook page or facebook group - just don't tell people to click your ads, and be careful to watch what the visitors from facebook do while on your site.
I totally agree with you I have my site on facebook and its not wrong if you are not participating in click rings .