iMessage, the texting app on iPhones, shows messages from other iMessage users in blue bubbles. All other messages, (i.e., Android, Windows Phone (RIP), and others), appear in green bubbles.
He absolutely would be a great pick. And I suspect he would be interested. What I wonder is: how much would it grow Lemmy and the Fediverse? Impossible to tell, but even if it's only a small gain, I think it would be worth trying.
Prehistoric: appears in a Usenet forum
Ancient: MySpace
Decomposed: Facebook
Fresh corpse: Instagram
Elderly: Twitter
Midlife: Discord
Teenage: Reddit
Actually fresh: Lemmy