So I just posted a reply to @Gargron's post from my #Smithereen instance. My first reply to someone else's post to contain an LD-signature.
Then interesting things started happening! First, I received an onslaught of incoming requests for... something. I don't log GET requests. I knew Jetty is multi-threaded, but I didn't know it's this multi-threaded. Second, someone with a broken SSL configuration tried to follow me.
I presume that's how you know you're now a proper part of the fediverse?
@grishka Yes, when you publicly reply to a post, and it has an LD-signature, we forward that reply to the parent's followers, so that people who click on the post get a more complete conversation.