9-28-10: Nathan&PJ I’m @ WYPR

Nathan Jurgenson and P.J. Rey: These two sociologists may specialize in social media issues, but they still know how to interact face-to-face.

Have you seen Twitter posts that look like our headline? Then you’re at least a little bit familiar with Foursquare, the Internet’s way of telling the world where you are at any given moment.

How does it work? Today we turn to our social media gurus Nathan Jurgenson and P.J. Rey to explain “geotagging,” which embeds data about your physical location into pictures, Facebook posts, or anything else you might share online.

If you’re a bus, geotagging can also tell your riders when you’re coming.

Nathan and P.J. share their thoughts on this New Yorker profile of Facebook founder Mark Zuckerberg: Nathan and P.J. talk about the risks of geotagging for the privacy of users of sites like Chat Roulette: P.J. talks about hyperlocal crime mapping: