It's a picture as much as any particular character in a font is, which is to say, it is. We're just very used to recognizing particular variations and combinations. There's one problem here that can be expressed in two ways, one is a proliferation of many new characters which people may not know the idiomatic usage of until they've encountered it in more context, the other is new combinations of known characters and words into a new idiomatic usage that has the same problem.
Consider that there was a time not so long ago where the vast majority of people didn't know what LOL meant and would be confused when encountering it. On the other end you could probably copy some heavy British slang in here right now and I would be very confused.
Edit: or have I completely missed the point of what you're saying!