There was a real use case for latitude, but I don't feel like they pulled it off right. I live in MA, and my brother lives in WI. We decided to meet each other in NY once while he was with friends. We used latitude as a way to communicate our location as we tried to find each other. It worked a lot better than saying "meet me at the shake shack" since neither of us knew the area.

The problem with it though was it was slow, thus typically outdated. So 90% of the time the information was simply not useful.