I found these funny images on Facebook. Is it OK if I post them on Reddit without asking the original image maker?
Yeah, why would you want to repost these things from Facebook?
Because nobody from Facebook is posting those images on Reddit yet.
If the images on Facebook don't belong to you, then taking them and reposting them on Reddit is stealing. Ask permission from the original owners before reposting.
I'm bored and have nothing to do on reddit. I have no other choice.
You have one other choice, which is to get permission and credit the original owner. People will think less of you if you pass off other people's work as your own.