At this year’s SXSW gathering, no topic is more buzzed about than location-based social network apps, like Glancee, Ban.jo, Sonar, Intro, Kismet and others, Washington Post Lifestyle reports.

There are variations to these location-based social networks, but the basic premise is to link a profile and connections of a social network like Facebook, with the locations logged in mobile phones.

Privacy concerns will be a major factor in the popularity of social discovery. Many are wary of distributing their location to the wrong people, and stalking concerns will surely keep others away.