What? FriendFeed is a service that makes it easy to share with friends online.
Why? FriendFeed enables you to discover and discuss the interesting stuff your friends find on the web.It's simple, conversational and open.
What? Twitter is a free social networking and micro-blogging service that enables its users to send and read messages known as tweets.
Why? Because even basic updates are meaningful to family, friends, or colleagues—especially when they’re timely.
How? With Twitter, you can stay hyper–connected to your friends and always know what they’re doing. Or, you can stop following them any time.