I've had to take a look at my bookmarks since I only have a very few amount of sites that would probably count as a favourite. I visit a lot of different sites daily for research and all that good stuff, to the point of having over 80 tabs at a time. That is one of the reasons why I need a lot of memory. They're mostly JP/KR sites and wiki for anime/manga I follow.
The top one off my list is AnimeSuki. I've been on that community for over a decade and it's still lively today. I love the discussions over there. Other sites that I visit often (enough to warrant as a favourite) include Crunchyroll, Hummingbird, LINE Webtoon, MacRumors, Naver Comic, and reddit. I'd normally include Baka-Tsuki, but I hardly visit it nowadays after seeing them drop the only novels I read. I hate how YenPress had to be the one to license them. I'm all for legal stuff, but NOT if these chumps are responsible for taking years just to release the latest volume—that is if they even get to it without putting up excuses.