Facebook recently introduced auto-playing video ads on desktop and mobile, but thankfully there's now a switch to opt out. Here's what you have to do. For Facebook on the desktop, you can turn off auto-play videos in your settings: On Facebook, head to the drop-down menu in the upper right-hand corner and go to Settings > Videos. You can also click here to go straight there. Next to the Auto-Play Videos setting, click the "On" box and change it to "Off." Safari users may have to try using another browser, as some people are reporting that this setting does not show up in Safari for some reason. Unfortunately, there is no way to completely disable Facebook's video ads on mobile. However, you can disable them when you're not on Wi-Fi.