A lot of guys are asking how to meet people. Can we compile a reference of websites/apps/other ideas how to connect with other gay/bi men (for different reasons)?

i.e. what's best for: a) casual hookups b) relationships c) friendships/social networking

Not having used grindr and asspoundr (or whatever it's called) I have no idea on this and it'd be great if you guys can chip in. Also non-internet things on where to meet people especially if you're closetted.

If this has been done somewhere else please link it so we don't have to reinvent the wheel :)