If you use the Facebook app on your tablet, phone or mobile device (especially 3G or 4G Internet connections), watch out – MoneySavingExpert.com has confirmed that Facebook's default habit of auto-playing videos has been causing some phone or tablet users to exceed their monthly data limits without even realizing it — until they're hit with overage bills.
Luckily, the problem is fairly easy to fix. If you have an iPhone, go into “Settings” and choose “Facebook.” Then click “Settings,” then “Auto-play,” and choose either “Wi-Fi only” or “Off.”
With an Android, go into the account settings of your Facebook app. Click “App settings” and then choose between “Auto-play only on Wi-Fi” or “Off.” (Personal preference: go with “off” in either case, so you can choose which videos you play even over wi-fi.)
Simple as this problem is to fix, critics could point out this problem wouldn't be a problem in the first place if Facebook didn't default to automatically playing any and all videos appearing on a user's Facebook feed; the mere fact that your Facebook friend posted a video does not mean you want to watch it at all, let alone watch it on your limited-data-plan mobile device.