Yoono is a Firefox extension that simplifies your social life on the web by centralizing all your social networks and instant messaging in one easy to use browser sidebar. Get all your friend updates automatically wherever you are on the web and update your status instantly across Facebook, MySpace, Twitter, and more. Yoono also shows you personalized recommendations for related websites, products, videos, and more based on the page you are viewing. Easily share these discoveries with your friends via your social networks!

AlertThingy brings the latest updates from your favourite social networks direct to your desktop. Plus send Tweets, update your Facebook...
TwitSnip is a simple bookmarklet tool for easily posting to Twitter. It lets you "quote" text on any web page....