Still, that's a lot of shut-ins ...

From ComputerWorld: "A study released today supports the oft stated notion that most of Twitter's 75 million registered users are less than committed to the microblogging site. The report, compiled by Barracuda Networks Inc., an e-mail and Web security company, concludes that only 21% of people now signed up for the Twitter Inc. service use it regularly."

參考來源： Only 21% of Twitter members are active, report says (在「Google 網頁註解」中檢視)