If you're an avid Foursquare user who's had an account for at least a year, you can find out! 4Square&7YearsAgo is a simple site that uses your Foursquare check-in data to remind you each day of what you were doing the year previous. A year ago today I ate Mexican food and drank a margarita at a favorite neighborhood spot (perhaps a day late celebration of National Margarita Day?).
The simple site sends you an email every morning reminding you where you were. It's a fun way to relive good times and is even encouraging me to check into places more often for posterity's sake! Foursquare fans, check it out at 4squareand7yearsago.com.