When you connect the app your check-ins surface local historical photos through SepiaTown, a crowd sourced database of historical photos.
What’s awesome about Fourstalgia is both how simple and immediately rewarding it is. You get additive content that is completely relevant and it is built right into your Foursquare experience. If you want to share the photos you can tweet right from the app.
The only thing on my wishlist is additional historical information that tells me more about the pictures. You get a short description, but I need to know everything about the Quartette Club Hall in Hoboken right now.
Try it out and let me know what you think.