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 I have no idea how activitypub works or what it is. And now I’m no longer afraid to ask it!

Explain it to me like I’m 5 👦 

#asknostr 
 Write posts, notes, and other stuff, and they get sent to your followers. 
 But how is it different from writing notes in a client? 
 No different.  ActivityPub lets you write notes in a client, then sends it to your followers.  It uses an inbox and outbox to send and receive. 
 And why do I see some notes that have an “activity pub” kind of badge then?