The new Facebook policy will not allow announcements of known digital currency exchanges or initial offers of currencies.
Is it to avoid fraud or false advertising? That's why?
In my own opinion I’ll say it’s both to avoid fraud and false advertising, they are trying to protect the interest of their users. I must commend them for that, so many icos have emerged including the scammy ones and Facebook might not have so much expertise in differentiating the scam from the legit, so the best option for them is to disallow the continuity of such adverts/ promotions. Actions have been taken cause I noticed a lot of Facebook pages promoting their icos were closed down