What are the biggest sources, channels (YouTube channels/influencers, Twitter accounts/influencers etc, ICO rating websites) online that you use to find out in which ICO to invest in?
I think the biggest source is social media, and this bitcointalk forum.
The investors who see advertise in social media will be interested and come into this forum to find out the project.
Later they maybe search for video in Youtube to get more explanation about the ICO project.