That text-field placeholder used to be there, I recall seeing it in the past but now if you go to directly PM even one person (which you can only do from their page) the username is already filled in, thus erasing the text that used to assure people of multiple participants that it would be a-okay! And yeah a button with a fresh conversation (all fields NOT yet filled in) would be lovely! And glad to help. I hope my mild freakout about multiple recipients saves anyone else some concern. But hey, seeing the notifications are up and running is also pretty nifty so hopefully in the future, we may be able to get notifications about new posts in subscribed threads (since it might alert someone to check their subscriptions more readily)? (Not email mind you, but the small bell icon, since I figure it will be used for more than just mentions)