Which location-based networking service is defined as a mobile social mapping service and works on more than 100 mobile devices?

a. Whrrl

b. Brightkite

c. Loopt

d. Gowalla

The right answer is "c"

c. Loopt

The location-based networking service Loopt is defined as a mobile social mapping service and works on more than 100 mobile devices. Loopt was a company based in Mountain View, California, United States and had more than five million users. Moreover, Loopt had partnerships with every major U. S. mobile phone carrier.