"Hey there Sylvia! It's been ages since we last talked, like literally years."
"Yeah how have you been?"
Small talk
"Anyway I saw you in [online space we once shared] and noticed you're now going by Sylvia! And have new pronouns! Well guess what?"
"Same for you, I'm guessing?"
"Yes! How did you know?"
"Would you believe I've had this conversation N-1 times so far since I started to transition?"
Since trans people who haven't figured it out yet are eggs, I'm going to propose we start calling spaces where multiple people realize they're trans in a relatively short time frame a "nest."