That’s two twitter clones from two tech billionaires in just six months. Capitalism truly breeds innovation.

What’s the other Twitter clone (other than Threads)?

Bookwyrm is open-source, works similarly to Lemmy (i.e. is a federated platform). Storygraph and LibraryThing are also popular alternatives, but IIRC they’re both closed source.

Personally I think just creating a spreadsheet file with your reading data is better. (In LibreOffice, of course.)