HopStop today is pushing an update to its iPhone app called HopStop Live! that includes real-time user feedback in seven countries for 20,000 public transit lines. Users can submit info on any of the 750,000 that HopStop services that cues other users in to real-time updates, problems, or construction that transportation authorities might be slow to push out. According to HopStop, there are over 2 million active monthly users on the app, so this feature should prove effective at crowd-sourcing commuting information. Of course, many subways and public transit systems are without cell service as of yet, so such an update might not actually be quite as real-time as advertised. But if and when such service comes, this data could change the way users interact with their public transportation systems.