Foursquare fiends are not going to want to miss out on 4square and 7 years ago. 4square and 7 years ago is a new website that sends you daily emails reminding you where you were a year ago via your Foursquare check-ins.
I find it ironic that Foursquare originally started as an app and now has spawned its own apps. As the virtual world has consumed majority of the population, it is actually kind of nice to have a service like this to remind us where we were and what we were doing a year ago. Foursquare shows no sign of slowing down, which means that this app could potentially be used for years to come as a personal archive.