Foursquare to be as much about sharing experience as it as about connecting with friends and discovering new places.  Every foursquare user has the ability to create both "Tips" and "To-Dos" for places. Tips are generally things you'd recommend to others ("Go to PDT and try the bacon-infused Old Fashioned") while To-Dos are more "notes to self" ("Remember to come back and try the pesto noodles"). Whenever you check-in to a location, we'll try to pop-up a tip that one of your friends has left nearby (you'll be surprised how often these help you choose what to order at a bar or restaurant!). And, of course, you can take these Tips and To-Dos with you on your phone so wherever you happen to be, you'll always have a recommendation of something interesting to do nearby.