Yes you read it right. Facebook has an application named embee which can get you free mobile recharge. In this you have to earn embee points. Just follow the following steps:
Login to facebook and open embee application.
Enter a valid mobile number to signup(you get 50 free embee points).
Validate your mobile number and get another 50 embee points.
Now click Earn embee points more tab>> click on Signup for Email Alerts. Verify you Email & you get 50 more points.
Now to get more points you have to invite your friends and get 5 of them registered.
You can also go to friend tab and publish invite link
Click on invite history to check results.
Once you get it done, click on redeem to get recharge top up.