Tumblr tends to have more pop-feminist types, who lack the theory behind what's said and instead spout 'hot takes' without much substance behind them - this is pretty much the case for the likes of say Buzzfeed too.

I'd be willing to send some good introductory reading for the theory of both if you'd like, and be willing to talk to you as you read through them. Incidentally I feel that a sort of reading group is the best way to learn about both, given that a lot of the ideas can be confusing when first diving into it - it still can be for me lol.