Its been a while since we've been seeing ICOs happening.
Really? I see new ICO's every single day. Not only here on Bitcointalk, also on other sites.
Many ICO's make a Bounty campaign here on Bitcointalk (see bounty subforum). Where they offer tokens /coins for people spreading the word about the ICO on Twitter, Facebook etc.
Others simply pure in a lot of money in banner advertising around web targeting crypto enthusiasts.