Regular Facebook users will no doubt have noticed that videos in their news feed are playing automatically. If you're using Google Chrome, you can stop this from happening very easily.
The first thing you need to do is open your plugin settings by opening a new tab and pasting chrome://settings/contentExceptions#plugins into the address bar.
On the resulting window, enter the hostname pattern [*.]facebook.com and select block from the behavior dropdown.
Click done, and refresh your Facebook tab.
Was that quick and easy enough?