I've seen this particular tweet like a dozen times now, so it's definitely spread far and wide. Some people only think of image macros as memes, but yes the broader definition I've seen is essentially a viral concept.
Could we, without relentlessly criticizing, let people have... whatever little harmless things in which they've managed to find a tiny shriveled flower of joy?
If there was some other place to post that would get the same traction I'd gladly put it there. But its not really that big of a deal at the end of the day