I agree. It is really good. But I also want the ability to select my sources. For example, I don't care about Instagram or Pinterest either but there may be people who don't care about twitter.

My recommendation is to show everything by default and let the user "uncheck" the source for now. In phase 2 may be, you could make that a User level setting/default.

One source to add: HN :). For example, I know some very well known people are very active on HN. It will be nice to pull their comment history right there :). For example, "cloudflare CTO".