A journalist captured in Afghanistan told the world he was still alive over the weekend by tweeting with a prison guard’s cellphone.

This remarkable tale about a tweet kicks off a new meme here at Gadget Lab that we’re calling Tweet of the Day, where we’ll post our favorite tweets from just about anybody in our orbit: gadget customers, pundits, analysts, journalists, Silicon Valley bigwigs and so on. Each Tuesday and Thursday, we’ll be handpicking tweets that we find especially fascinating, enlightening, hilarious,

Clearly, some of us make bad decisions with our gadgets. (See Mel Gibson, above.) But even without having to live down a mobile phone-fueled tirade of Gibsonian proportions, many of us have sought