in their own neighborhood, spontaneously and in real-time. WSJ's Andy Jordan takes a look at two platforms: Loopt and Brightkite.

Andy Jordan shows how a 20-year-old engineering student with cerebral palsy has had his work and life transformed by a unique eye-tracking device. Home Browse Series Live Q&A WSJ Events From ...

YouTubers test out Ghost Radar, one of the most popular mobile apps for detecting "ghosts." WSJ's Andy Jordan samples the online amateur reviews.