In general, streams aren't against the Terms of Use unless they target a user, group of people or condone illegal acts. There are probably other ways a stream can be against the Terms that I'm not thinking of atm.
Images can be against the Terms or stream rules. I haven't seen any of those in that stream in a long time.
Imgflip has allowed "hot babe" type images since the beginning. Since you might be unclear on whats ok, maybe look through account #1 to see examples of what's allowed on Imgflip.
imgflip.com/user/Imgflip