Groovr has its growing pains with its location system. I keep accidentally checking into other people's work, or otherwise creating duplicate locations in the wrong cities.
I've been watching Twitter as an alternative, and now it seems that TwitterVision adds location to the service. The alias system looks like just the right solution, so maybe I'll create a Twitter account now.
To be honest, it's sometimes hard to remember to update Groovr, but now that I think about it, I may miss posting photos if I switch to Twitter. Hmmm... Really, I just wish Groovr would get their location/alias system working better. They're shooting for shared hot spots on which people can converge and otherwise socially interact, but I just want geo-tracking and a photo stream.