The why may be a matter of whether you own a smart phone or not. People tend to have more desktops/laptops than smart phones. I believe most location based networks rely on smart phones capabilities. For example before I didn't have an iPhone, so I didn't have a loopt account, now that I have an iPhone I use loopt. Other social networks are easily accessible with either phones or computers therefore a greater user market.
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The why may be a matter of whether you own a smart phone or not. People tend to have more desktops/laptops than smart phones. I believe most location based networks rely on smart phones capabilities. For example before I didn't have an iPhone, so I didn't have a loopt account, now that I have an iPhone I use loopt. Other social networks are easily accessible with either phones or computers therefore a greater user market.