"Mobile location sharing is still relatively nascent. Data shows that usage of location-based social apps on mobile devices grows only incrementally year over year, despite the hype surrounding mobile apps like Foursquare, and the fact that many other apps are introducing layers of location-based 'Look at where I am!' features.
"And, of course, more recently we’ve seen the downside of those location-based services, with the much maligned Girls Around Me app, which triangulated data from Foursquare and Facebook to let creepers know where females were congregating."
(Published April 9, 2012.)