A system is disclosed for providing a platform for creating, browsing and searching a journal of a user's activities. The system comprising a data storage area to store: a user database, wherein information pertaining to one or more users is stored; a location group objects database, wherein one or more location group objects are stored, each object comprising a timestamp, coordinates and motion status of a user; a points of interest database wherein one or more location points of interest of the user are stored, the points of interest comprise data relating to the user from one or more data sources on a network that index data based on time; and one or more servers coupled to the user database, location group objects database and points of interest database via the network, the one or more servers programmed to execute computer program modules, the computer program modules comprising: a tracker engine configured to (1) receive and process data from one or more sensors sensing the location of the user and (2) generate a plurality of location group objects that comprise a time, coordinates and motion status of the user; and an annotation engine configured to assign a physical location to each location group object.