Facebook knows what you're doing on other sites and in real life. This tool lets you see what it knows about you. (FB)

· Facebook just released a new tool that lets people see how it tracks their "off-Facebook activity."
· The social network tracks the websites, apps, and even real-life stores that users visit in order to target highly-tailored ads to them.
· Mark Zuckerberg first promised that Facebook would release an off-Facebook activity...