If your smartphone doesn't have much space, then apps like Facebook can be a huge drain on your device's storage. The app can suck down your data, too.
If your cellphone doesn't have a fast connection or that much space, then you'll be excited to know about Facebook's Lite app. The app targets emerging markets that only have access to 2G data.
That doesn't mean that you can't benefit. Facebook can be a massive drain on anyone's data and an app like this could alleviate some of the pressure.