I've done a fair amount of searching and can't find a straight answer anywhere.
The main problem I keep running into is not knowing who to trust or where to start. There's a ton of conflicting advice out there and half of it feels like it's from people who want to sell you something.
The free tiers on most of what I've tried are basically useless — you get just enough to see real people are there, then hit a wall the moment you try to message anyone.
If you've got experience with any platforms or approaches that work, drop them below.