UberPOP is what we have in Helsinki. You're able to split the fare with multiple users, whom you know, going the same route as you are. Imho actual ride sharing

UberPOP is what we have in Helsinki. You're able to split the fare with multiple users, whom you know, going the same route as you are. Imho actual ride sharing would be the "taxi" picking up random other people along the way and then the service billing everybody fairly in the end. With UberPOP fare splitting is just a convenience feature of the service, i.e. "instead of you giving me that 5 euro note for your share of this taxi ride, let's do it automatically". Maybe pop works differently in places which have both it and X though. Those descriptions certainly make it seem like that.