Loopt

Loopt is a Silicon Valley based startup that has built a revolutionary social mapping service to change the way people use mobile phones to keep in touch with their friends. Loopt facilitates real-world interaction between friends and puts an end to frustrating missed connections.

Using location-based technologies, Loopt lets you know where your friends are by automatically updating maps on your mobile handset. Loopt even lets you send messages to nearby friends or receive automatic alerts when they're nearby so that you never miss an opportunity to meet. Loopt also lets you journal your life so that your friends can see what you're up to. With Loopt, mobile subscribers put themselves on the map.

Loopt is backed by venture capital firms Sequoia Capital and New Enterprise Associates, the same firms that helped found Google, Yahoo!, PayPal and TiVo among many other technology innovators.

Loopt is available on Boost Mobile and Sprint Nextel and will be available on other major US carriers soon