When it comes to social networking, Twitter is one of the hottest sites around, and has become the online home for celebrities, politicians, sports figures and lots of folks like you and me.
Twitter is a simple concept. The key element of the site is the "tweet," a 140-character answer to the question "what are you doing?" If you care about what a certain person (tweeter?) is up to, you can follow them with a single click. It's a simple and fast way to keep up to date with friends, stars and even the White House.
Echofon is an easy to use app that enables you to read other people's tweets and send your own. It includes support for all major Twitter features, such as links and direct messaging. Using the iPhone as a Twitter machine somehow seems right, given the simplicity and speed of the site itself. Launch Echofon and see the latest entries instantly. Oh, and did we mention Echofon is free?