I treat jokes as things that can be verbal or written. Pictures, no matter how funny don't have a place in the jokes thread. It also has the benefit that text can be searched so that posters can make sure they aren't repeating jokes. So if I have any amusing picture/meme the only reasonably suitable place is the cartoons thread, even if the picture isn't a cartoon. One answer is to create a "Memes, funny pictures (not cartoons)" thread.
That's just my opinion and how I choose where to post my stuff. Post according to whatever you feel is right, it's not even a small mound I'm willing to die on.