I'd call facebook hookup underrated, but that is one person's read. Ran facebook hookup alongside Facebook Dating for over a couple of months — same effort on both, quite a lot different outcome. There is a version of facebook hookup that works well for most users, and it starts with deciding to set your radius wider than feels sensible. For anyone weighing up facebook hookup — how it performs in practice is real, but it's manageable if you never send money or a 'verification' fee on a hookup site. Two things moved the needle on facebook hookup for me: set your radius wider than feels sensible, and patience — the other factors are secondary.
I will report back on facebook hookup if anything changes.