Let's try this and see how it goes. Here's how it works:

First person: lists a thing they'd like a rec for, like "rec me hot m/f."
Person replying: gives a hot m/f rec, and then says what they'd like recs for, like "rec me creepy casefic."
New person: starts a new subthread with a new recs request.

And so on. In theory this should spawn lots of little subthreads full of recs! Say as much or as little about the recs as you want.