No man is an island no man stands alone". We human beings cant live without friends. Friends are the real asset of our life. So its becomes very important for us to keep a track of them and even mark our presence in there life. So wherever you go just take a picture of it and add it to your checkins list. Also post a comment about it to your FB account. Your friends can now see where you have been. So in this way you can locate your Buddies without missing anything of there life.