meme

A  meme  in the context of the IndieWeb is a special photo (or photo reply) post consisting of a funny or provocative image with a brief text note overlaid on top of it, usually in all capitals white text outlined in black, similar to a single-pane comic, yet with text that reads like prose rather than a caption.

In general a meme is an idea that propagates through minds by replication (the idea itself encourages those understanding it to propagate it to others).

Aaron Parecki
on aaronparecki.com since 2018-08-02 (at least, may be earlier examples)
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 * posted as a photo reply in-reply-to an IndieWeb note

Chris Aldrich
example from 2022-05-11 (possibly earlier examples)
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 * posted as a photo reply in-reply-to this tweet https://twitter.com/ViRAms/status/1524549207515881472