Some days ago a friend told me that his team just published a brand new iPhone and Android App called Spotnick that allows mobile Facebook users to immediately locate and track their friends. After connecting to Spotnick by using your Facebook account, you are shown a map on which you can locate your linked Facebook friends. As far as your friends are not updating their location in realtime, Spotnick uses the actual home address, or the last known address your freinds entered within Facebook. The Spotnick app also allows to track and update your own address in realtime, so that you can select people who are allowed to see your realtime location. Spotnick app was published for Android as well as for iPhone.