If you thought the downfall of Twitter began when Oprah said it was the best thing ever, well, you're probably right, but this latest toy from Mattel won't help to improve the situation. It's called Puppy Tweets, a little clasp that hangs from your pooch's collar and detects what it's up to -- presumably making wild guesses based on accelerometer and microphone readings. It was announced last month and is being shown off at the NY Toy Fair, wh
