Facebook lite is a lighter version of Facebook with better features covered further. It is available in play store for free.
Why to go for this app since we have original facebook app? First of all it consumes very fewer data as compared to original one and yes it can be run on 2g.
Also, it takes lesser storage space than original one. Also, it runs very smooth and has all the features of original facebook.All the add-ons work very well in this app. I personally had a great experience while using this app.