I always see some big ICOs doing facebook advertising, this is to spread the news about it. you can specifically targeted audiences to whom these ads of your are going to display. bitcoin adnetworks will also be a big help for you. if for instance you want your ad to appear on coinmarketcap adboxes, you can do google advertising as well.
Thank you for good advise!
I've found more than 20 bitcoin adnetworks. Who is the most effective? How do you think?