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?
In my experience, we should observe the information on Bitcointalk.org for the announcement (Altcoin). You can find out the details of each ICOS project to get the best view of comparison and participation.
There are no entry here, but there are several sites in the giver's rating of ico. Moreover, some project that held them, sometimes the ieo was announced and promoted through the exchange.