In my case I've experienced that my posts was deleted on facebook, everytime i posting regarding with my one facebook bounty it always deleted,but why does some of my post on facebook related on bitcoin was not deleted?
I thought bitcoin banned on facebook,why is it not disame?

I think it would be the both sides loss. Bitcoin's loss because facebook could really help bitcoin in advertising as they are the biggest social media site that could reach billions of people worldwide. Facebook's loss because of the opportunity that bitcoin can give them.

But I still see some ICOs being advertised on facebook, I do not know what happened yet. Maybe facebook has changed the policy. Accept ICO ad.

One of the reasons could be, that these ICOs are really enticing. Unfortunately, most of them are not worth it to invest and many people didn't get their anticipated return.

Since i keep getting warning messages/spam messages on facebook, i have stopped putting up ads relating to ICOs or carrying facebook campaign. It irks me to get all those messages. I'd rather do Twitter.

This has been reported many times over, and I think people are just in a state that they can't believe it because it's one of the foremost departments of bounty campaigns where people usually enroll in. Having said, I think that it's not a permanent thing, if not, something that would be done without qualifications. I think that Facebook is doing this to minimize the trash content in their system. I say that because many users actually post nonsense that it burdens their system, so Facebook just wants to control that for the time being.

Facebook, at least tries to justify its position with common sense. After all, everyone understands that in addition to obviously forbidden directions, for example, advertising of narcotic substances, there are still many topics that are extremely painful for an unprepared user. I'm not sure that it is ICO that is the main evil on the planet, but apparently the administration of the American social network thinks so, therefore the amendment to the community rules maximally extends the policy of enforcement in respect of a number of advertising products.

That's just banned advertising ico on facebook because of the amount of scams exit ico. Facebook only protects their background because of it ..
As they say, "We want people to continue to discover and learn about new products and services through Facebook ads without fear of scams or deception. That said, there are many companies who are advertising binary options, ICOs and cryptocurrencies that are not currently operating in good faith."

I think there are still some cryptocurrency ads and ICO hanging around in the facebook window, and there are also google ads that still provide cryptocurrency ads, in my opinion it's just a conspiracy alone that makes new investors play panic and eventually sell their assets and many players old who took the opportunity to buy as much as possible.