Some people think that no one should post a meme that they did not dream up entirely on their own. Google the definition of "Meme". The actual definition of "meme" : memeDictionary result for meme
/m?m/Submit
noun
an element of a culture or system of behavior that may be considered to be passed from one individual to another by nongenetic means, especially imitation.
a humorous image, video, piece of text, etc., that is copied (often with slight variations) and spread rapidly by Internet users.
To tell people that they should not pass them on is absurd. I for one would be flattered and pleased if one of my memes got passed around the internet. So would plenty of others. However, on the imgflip site itself it is better to wait until a meme is no longer in the front page to repost. Because how boring is it to see the same meme repeated over and over again several times? So if you want to repost something cool you saw, just give it a few days before you repost. And if some troll shows up to give you heat, just screen shot the definition of "meme" for them so that they can get a clue. Mean while, meme on. :)