HTTPS is a secure protocol, which employs encryption. To login to Facebook on https, simply go to https://www.facebook.com/login.php . It is actually just HTTP over SSL.
If you are already logged and attempt the https URL above, you would be prompted to enter your password again to contain.
Steps to enable https browsing on FB:-
Go to Security settings page under account settings:- https://www.facebook.com/settings?tab=security§ion=browsing&view
Select “Browse Facebook on a secure connection (https) when possible” and save the change. Logout and login again.
HTTPS stands of Hypertext Transfer Protocol over Secure Socket Layer. This medium of communication involves encryption and decryption of data to protect your privacy. Most websites that use some sort of payment gateways always use HTTPS combined with certificates to protect the data. You would have already noticed the use of https connection on travel booking websites, online banking, and other websites. Encryption makes it virtually impossible for unauthorized people to view information traveling between your computer and websites like Facebook. HTTPS directs messages to a secure port than that of the default port 80.
Details of Facebook SSL Certificate as of 10th June 2012:-
Verified By: VeriSign Trust Network
Encryption: High grade RC4 128 bit encryption
Issued On: 17th November 2011
Valid till: 14th July 2012