You ever use Danbooru or Gelbooru? Well, those are basically websites where you posts images and tag them. Typically, they are centered around anime (especially H material). Those two are general “if it’s anime-related then post it here,” but they are others that target certain niches. Konachan is a website for absurdes images (high-res images, basically, meant to be used as wallpapers), for example.
I just found the best one out there: Sakugabooru! What is “sakuga”? I won’t go into the cultural/linguistic bits (it means “drawing pictures” apparently… that translation is implying something more akin to “moving pictures” than the act of “drawing pictures” I think?), but basically it is really awesome animation. Sakugabooru is a website where people post sakuga animation, then. Which is awesome, because that is the biggest reason why I watch this stuff (cute girls are the tip of the ice berg)!
Here are some of my favorites!