Abstract: A mobile terminal may include a sensor to sense movement of the mobile terminal. The mobile terminal may also include logic configured to receive information from the sensor and generate motion-related information based on the received information. The mobile terminal may also include a transmitter to transmit the motion-related information to a second mobile terminal to produce an effect to a user of the second mobile terminal.

Abstract: A portable communication device includes an application program for determining crowdedness of a desired location. The portable communication device executes the application program to communicate within a wireless communication system for requesting mobile critical mass information for at least one desired location. The mobile critical mass information for the at least one desired location is received and converted into a user-understandable format. The converted mobile critical mass information is displayed as crowdedness information on a display of the portable communication device. Portable communication device users can seek out or avoid crowds depending on their preference.