Not all single-purpose devices are bad, but this was the worst. The Twitter Peek allowed Twitter fans to check their feed and post updates using a built-in keyboard. While cute, the device showed only 20-character previews of your Tweets, forcing you to click to see more. And the built-in browser was buggy. It didn't matter that you had a choice of payment plans (free service if you paid $199 up front or $7.99 monthly if you spent $99). There were plenty of free apps for cheaper smartphones that did the same thing. Perhaps the Fail Whale should have been printed on the box.