Why you need to pay attention to Foursquare, Yelp, Gowalla & co.

1. Location-based services Why you need to pay attention to Foursquare, Yelp, Gowalla & co.

3. SXSWi: Foursquare got 76822 new users 10 percent of checkins were in Austin

4. SXSWi: Foursquare had 50 percent penetration – in the home of GoWalla

5. Point of Foursquare: Find your friends. But City Guide is next push. See where your friends have BEEN.

6. Foursquare: Could it become the digital generation's Zagat?

7. Badges & mayors are the hook for Foursquare — not the point

8. What's next? “ Passive checkins" Use your credit card, get checked in

9. Potential uses: Shack HQ iPhone app - Tells you how long the line is at Shakeshack, using (in part) Foursquare checkins.

10. Do you have time to devote to LBS?

11. You can't afford not to.