What information does Facebook get when I visit a site with the Like button?

If you’re logged into Facebook and visit a website with the Like button, your browser sends us information about your visit. Since the Like button is a little piece of Facebook embedded on another website, the browser is sending info about the request to load Facebook content on that page.
We record some of this info to help show you a personalized experience on that site and to improve our products. For example, when you go to a website with a Like button, we need to know who you are in order to show you what your Facebook friends have liked on that site. The data we receive includes your user ID, the website you're visiting, the date and time and other browser-related info.
If you’re logged out or don’t have a Facebook account and visit a website with the Like button or another social plugin, your browser sends us a more limited set of info. For example, because you’re not logged into Facebook, you’ll have fewer cookies than someone who's logged in. Like other sites on the Internet, we receive info about the web page you're visiting, the date and time and other browser-related info. We record this info to help us improve our products.
As our Data Policy indicates, we use cookies to show you ads on and off Facebook. We may also use the info we receive when you visit a site with social plugins to help us show you more interesting and useful ads.
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