Is Airtel 3G offering free facebook?

I know that some time ago Airtel had an offer of free facebook, but that was for a limited time period. The other day I opened my Facebook page on my mobile and when the summery appears it showed the data I used and the cost as being Rs0. I tried Facebook after some time and the same summary came up and also another indication was that my balance was not deducted, even though I have not activated 3G or 2G on my phone.
Is Facebook free on Airtel?

Nothing is free on any network.

Yes Facebook was free for Airtel users some time ago, but I think it was for a certain amount of of usage and a limited period. After that I brought a data plan so don't know. Just to make sure you should call Airtel customer service and ask them, you don't want to be using Facebook for a long time and then find out that your balance has got deducted.

I think it is free, that's what the airtel advertisement shows. However, there might be terms and condition for free facebook on Airtel.

There are some packs for using the free Facebook on your mobiles.

Hi

yes i know Airtel Offering Free MB for Facebook, Whatsapp & Youtube. But can you update me How to activate this offer ?? If you know about it please update me.