What do all of these have in common?
The Fediverse
Bluesky
Threads
Flipbook
Wordpress
and soon, Tumblr
The reach is growing! 
#ActivityPub #Fediverse #Bluesky #Threads #Flipbook #Wordpress #Tumblr
https://techcrunch.com/2025/02/11/tumblr-to-join-the-fediverse-after-wordpress-migration-completes/
TechCrunch · Tumblr to join the fediverse after WordPress migration completes | TechCrunch
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Sarah Perez 
@ercanbrack well, each one except BlueSky is integrating ActivityPub.
Is that what you mean? Just don't see the connection with Bluesky.