Is there a specific game you want to meet others to play? Web-based matchmaking is no small task and probably well outside the scope of what we have the manpower/bandwidth to do, aside from providing a forum where people can simply post on the matter. There are, however, a few such sites for specific games. For instance, there's destinylfg.com, I think it's called. Also, destinytracker.com has a section for helping people pair up for raids. I don't personally know of a site that does it more globally, but it seems quite possible there is one.