So if a woman likes, literally everything you post on Facebook, is she into you

No. She is into Facebook! :)

it's somewhat likely, but not a given.
she could just be on FB a whole f'n lot with a trigger-happy 'liking' finger.

She's stalking you. Don't stick your dick in crazy.

Most likely or she likes you but she’s crazy

Maybe. Maybe not. Some people just "like" every post they see. Who knows.

She wants the 🍆

That would be my conclusion.

check if she likes other people stuff

No, it's just Facebook