Knowing a new country or city is something that I love, sadly cannot do it as much as i would love. Its a completely different the experience when you know someone and this is the simplest way i know to do it, facebook groups used to be useful but every time i get into them they feel like a flea market, everyone selling their own stuff
I used to rely on Yelp to get to know a place, now i meet people through this.(Tinder is not the type of relationship i look for).
I am not fan of the Couchsurfing philosophy, thankfully this service is moving away from that into a Network to meet people.