They aren't banning ICOs outright. It's all about how you frame your Ad. If you are spreading awareness on your tech or company and not advertising the ICO event - you are in the clear. They are trying to prevent scammers from saying "invest money into this ICO and become rich", which is what most ICOs have devolved to.

You can post about your ICO. You cannot ask people to participate though or advertise incentives like "25% off PRE-ICO participants!". You can however talk about your tech, your team, whitepaper, etc. Just don't ask for $ or advertise ICO promotions. I do a fair amount of advertising on Facebook and can confirm that they aren't just blanket banning ICO ads.

Gold is not a better form of currency, but is more valuable than Bitcoin. Gold has inherit value  to it (it's physical, I can make use of it, and it's shiny) while Bitcoin is built on faith-in-value.