sentences:  Loopt's geosocial networking services, similar to the likes of whrrl, buzzd, and brightkite, show users where friends are located and what they are doing via maps on their mobile phones.It is available on select devices across Sprint/Nextel, AT&T, Boost Mobile, Verizon, and MetroPCS, as well as the iPhone, Android and BlackBerry.Mobile application — the Loopt software provides real-time location updating (with the exception of the iPhone until OS4.0 ships - see below).