The real reason behind this new decision is that Mark Zuckerberg is planning to release his own cryptocurrency. There is a hidden plan behind the curtain that is slowly revealing itself alone to the potential investors. I don't think that other developers will be very fond of this because with current capital and technology facebook could make a breakthrough on the market. Other ads that are currently promoting designated cryptos are a threat currently to the Facebook because if Zuckerberg plans really to release his own crypto promotion of other crypto is the first step to start his potential plan.

Here is a link to an interesting article about  the possible Facebook cryptocurrency:

https://hackernoon.com/facebook-could-launch-the-ultimate-cryptocurrency-2e6a5b65665b

I'm afraid that facebook can do whatever the hell it wants, this will impact a lot of projects looking for the extra visibility on one of the largest social media sites.

True that there will be scams but this is the same for many industries that advertise on the internet, facebook will lose money but with the amount they make I can't see anyone losing sleep over it.

I think it's fine to ban ads - those from those wanting to scam people. BUT Facebook is guilty of also being used as a mouthpiece for fake news. Plus Facebook Live - where murders have been broadcast and sexual assaults. They should sort this massive problems out but no, they go for the easiest way to generate some good-ish PR.

this is a surprising decision on the part of facebook, because if they refuse cryptocurrency-based advertising such as bitcoin, altcoin, and ICO, they will certainly miss out on huge profit potentials.

But if viewed from the good side, the goal of facebook is nothing but protecting its users from fraudulent acts that occur in the ICO project because the role of facebook as the largest social media in the world is very influential on the spread of something.

.       People all over the are using  social media, especiallly advertising products so easily. Bitcoin is one of them or tokens too. They are good part of social media helping others. So if Facebook will ban bitcoin, how about the other online business which are scammers, fooling people to join the collecting money to the people through Facebook even though they legit as they said. But bitcoin  is just being advertise by so many people around the world , they never collect anything but to reward them for their hard wok. It’s so unfair for the Facebook users.

Defenitely, I'm worried when the others Social Media Network also follow-up on this. It seems will be very difficult in running and promoting an ICO. Because people mostly wasting time and reading an advertisement on social media and not interested in seeing it elsewhere.

I dont think I have ever seen a crypto related ad on facebook that i thought was worth clicking on, therefore I couldnt care less. Facebook are able to do what they want with their own site and whether they are doing it out of protecting unfortunate people from the likes of bitconnect or if they are doing it to cull the heard before they start pumping their own crypto, it doesnt really matter does it? There are far better places to learn about upcoming icos or news on coins or markets or FUD.

Yes I agree with you, facebook will lose if you forbid us to put bitcoin or ico ads.Crypto is very popular now, maybe the facebook will think it over before taking further action.

the freedom of expression in facebook is limited because of this, or their main intention is to create their own cryptocurrency.