Facebook may already be tracking your usage to serve you ads, but how would you feel if it was able to log your movement? That's exactly what could be on the cards after the company confirmed it's bought Moves, the always-on fitness-tracking app that automatically records your daily activities using only your smartphone. Moves says that it will join Facebook to "work on building and improving their products and services with a shared mission of supporting simple, efficient tools for more than a billion people." Luckily, Zuckerberg and co. will let Moves' iOS and Android apps remain independent, noting that the company currently has "no plans to change that or commingle data with Facebook." The social network employs a similar policy with Instagram and Whatsapp, which set it back a whopping $20 billion between them.