ETA: And because people seem to think that only famous artists make something legitimate:
I'm not at all interested starting an argument, but I definitely do not think that. As I said in my initial comment, it can be a comic scan, a fan comic, or a web comic (or any kind of comic I haven't thought of). That comic image does not have to be the only thing posted, because you are certainly welcome to post fan art as long as that post also contains a comic image. I'm sorry if I was unclear, earlier.