This app was mentioned in 2 comments, with an average of 3.00 upvotes
Keadle spot - proximity based social network, not used much outside of Los Angeles
Waze - love and hate this app, i just assume it might take me on an adventure
Whatsapp - travel a lot and keep in touch through this
Totalrewards - i gamble a lot and look for comps here
-edit, added links