I still disagree. The variation with selective retention is the Twitter post being screenshotted rather than hyperlinked to i.e. the context, comments, likes, retweets, etc have been lost, the text retained, but instead mutated into pixels to be shared visually. Copied (the text), varied (into image), selected (context and source disregarded). The image has been shared across multiple different platforms, and is spreading as it is influencing cultural ideas and, potentially, behaviors. It has propagated through imitation and replication.

This is memetics at work. A screenshot of something shared to wider social circles is, much to many’s chagrin, a meme.

I understand the disconnect; the other commenter likely first encountered “memes” as entertaining images with text over them.