It's like twitter (microstatus update service). Except federated like email (service is not limited to one host and hosts talk to each other).
In a more practical example I often use it as a thing to quickly upload and share art.
Whenever Penelope dreams, the Neocities quantum waveform collapses to a new random position . :)
Or maybe because people are turning off their profile Activity. Or maybe you did post cringe.
Lost one too. Could be another code update