I have never been big on using those apps, but I have heard stories about Grindr helping others find out who's gay and who's not...Not only that, they meet people there and actually have grat relationships!
It really depends on the community you live in, I've anonymously browsed a bit and there are mostly just guys who want friendships/dating. There's the occasional guy with a pic of his abs with the bio " top. masc. looking to **** tonight"
Most guys in here that use Grindr have the "only straight acting gays" request even though they are busted as **** but in Philly I hooked up with someone from the air force and I regret not taking it further from what we did.
I found my third and fourth boyfriends on Grindr. It's possible but you have to deal with a lot of guys who just want sex. Even if they say they don't hook up, they'll try to offer a massage and get your clothes off. If you're like me it's all downhill once the clothes come off. But yeah, it's possible