AB-CHAIN is not going to use facebook or twitter to advertise for their clients, if that the case you can do it by you self, they has own network and websites that are going to put AB CHAIN ads, So what facebook did is good for this project since the main idea of AB CHAIN is to alternative to traditional platforms and accept cryptocurrency.
Don't worry, Facebook or twitter are not banning ICO advertising anymore. I can see a lot of ICO advertising on there.
Seeing ICO ads doesn't mean that facebook didnt not banned ICO and crypto, you can still see ads that violates their Advertising Policies and facebook mentioned that " We also understand that we may not catch every ad that should be removed under this new policy, and encourage our community to report content that violates our Advertising Policies "
So it's better for ICO to advertise in platform that accept crypto ads like AB-CHAIN than take risk and run campaing on facebook and when someone report them, they will loss money.
After Facebook announced that is removing all cryptocurrency and other ICO-related advertisments, it turns out that there are still some of these advertisement continue to slip past their ban. There will be a possibility that they will soon begin to filter out every advertisement contents manually. According to Facebook, they advertisement ban will be fully enforced over the coming few weeks.