Browsing the feed for 5 minutes, spends around 2 mega. In Facebook settings you can enable data saving mode.

To upload 5 photos, consumption is about 2 mega, in the app itself, you can enable "Use less data"to reduce spending.

In the lowest quality, consumption is 26 mega every 15 minutes.

Using the app for 5 minutes consumes about 8 megas. You can activate the "Data saving"option in the app itself.

On average, you spend 0.7 mega per page but it all depends on the type of site you are going to access.In read mode, you can consume less data.

To save on data consumption, It is recommended to adjust the video settings to medium resolution(480p) so you will enjoy your internet much more.

To listen to music online consumption is about 3 mega per minute.