The facebook lite app is useful when you have less data pack and slow internet speeds. Facebook lite app is downloaded more than 100 Million times and is less than 10 mb after installing and 1 mb before installing. The app totally works online it does not saves any data in the device. The facebook app is available in Android, iOS, Windows etc.
Most of the graphics and the functions are present in the app.
Some of the cons are:
In the page the detailed functions are not available as in the desktop version.
The stories or the status updates are not saved so it is NOT possible to use the app OFFLINE.
The videos cannot be stored offline to watch them later on without any internet connection.