Do you think there's more traffic you can get on social media? Since you need to target those crypto users before gaining some good results and provably the one you can see the ads there are not much on crypto. So best try to advertise first on big crypto sites like etherscan or maybe coinmarketcap since provably you will get a traffic to the real crypto user guys out there.
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It's not the way how cryptocurrency exchange platforms are advertised. There are a lot of things behind it and as I mentioned earlier, you need product manager, marketing manager, creative executive, etc... It's not just to ask your mate to give you some bucks and run advertisement on facebook on any website. Companies hire data analysts and all of these and pay a decent salary and believe me, they aren't silly. You need tons of money and experienced marketers, not suggestions from people on bitcointalk. If I tell you to advertise on any website and that's all, your business is popular, then no, it's very wrong.