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?
All this plus bitcointalk forum . In fact, I consider this forum the most valuable source of information, because there are often discussions that help to get complete and accurate information about projects. ICO ratings and social networks cause me much less confidence, because there basically just goes paid advertising
True, bitcointalk forum is a big sources for ICO investors. They can just simply visit announcement section for altcoins and find the ANN thread about the project there and twitter, facebook, instagram and youtube are obviously the biggest sources too for find out an ICO.