A smartphone with low android version and low ram cannot support the official app of Facebook
Don’t worry
Facebook has also made app for low ram and the name of the app is Facebook like.
It can be easily downloaded from play store and is the smallest app ever. The size of this app is just 5 MB where as the size of official app is 50 MB
It is the best app if you want to save your Data. It hardly use Data where as the other app use lot of Data .
But the features are as similar to the official app
So low ram mobile user, kindly download it.