Location-Based Services

Foursquare ... knowledge of your location important? Google thinks so. So does Facebook but does raise privacy concerns with Facebook Places.

Mobile geo-targeted ad rates reaching new highs? (Fortune) - true at least in dense urban areas.

Why Mobile Users aren't Checking In (Mashable) - tread cautiously Foursquare investors.

1 in 5 Smartphone Users Check in

Location-based service business could hit $10 billion by 2016, report says (LA Times)