Top 12 Twitter tools

Twitter - the exploding social Web phenomenon that lets users post 140-character updates to the simple question "What are you doing?" and follow the posts of friends - is very addicting. When you first start out, the Twitter Web site alone is enough for simple posts and following a few friends. But once your network of followers and those you're following expands, checking back to the Web site every 10 minutes is tedious. Here are 12 tools to help sate your Twitter hunger without having to constantly refresh your browser.