What exactly is a map adoption? That's one of the prefixes you can choose from when posting a new thread in this section and I've never seen it actually used.
Oshit, forgehub finally implemented it? I never even knew lol. Anyways, I'm guessing that it's for when you have a map going but realize you won't be able to finish it. You've gotten a good bit of the map done but you need someone else to finish it. Posting it up here with the <Map Adoption> prefix is basically giving other people permission try to pick up and finish where you left off.