We might never know the untold number of people who bought Withings' WiFi scale for tweeting their daily weigh-ins, but it must have been an impressive enough figure, as Fitbit just announced something very similar. The Aria Wi-Fi Smart Scale tracks weight, BMI and body fat percentage, only instead of sending those nuggets to Twitter, it all goes straight to Fitbit's own site. For people who have never bought any of the company's products, this website will understandably be a revelation, but in fact it's the same place where Fitbit Ultra owners go to see how many
