Update: Enjoy Free Facebook Browsing on Airtel prepaid mobile until 31st Jan 2014 & up to 30MB.
There is two way to get this offer first use the Official Facebook app. Download Facebook mobile app from https://www.facebook.com/mobile?_rdr and install it in your mobile, start Browsing Facebook without any Data charges.
If your Device is not capable of running Facebook Official mobile app, then you have to send the message. Create new Message and Text “FACEBOOK” in the capital and send it to 54321. Then you will receive a reply from Airtel Enjoy Free Facebook Browsing on Facebook Mobile Application till 6th Fab,2013. After that, you can use Facebook free from Facebook app Facebook for Everyone and browser.
Note: Free Facebook Experience up to 500MB/Month.Valid on only Browsing on WWW.Facebook.com ,m.facebook.com, and usage with the Facebook mobile application. If you open any External link (out of Facebook), the link will be charged as per standard rates and the offer is valid till 6th Feb 2013.
Note: I will update this post whenever I get information about Free Facebook for Airtel Mobile user, so for the Future update you can Bookmark this page, and if you have any information related to it, you can comment on this post so other can know about it.