Discussion of memes is always a little surreal for me, because I can never be quite sure what someone else means when they say the word. Probably because I encountered Dawkins' idea of a meme as a replicating unit of thought before "Internet Memes" existed. I start off assuming that others are using the term with my internal definition (i.e. correctly) but then encounter clues that they mean the internet-spread picture formats. However, there is rarely enough context to be certain which meaning is being used.
It makes me wonder how we communicate at all when no two people ever quite speak the same language. It also makes me a grammar nazi as I become aware of how important a uniform shared language is :)