Toxiclover, the "s" at the end of https stands for "secure." It's an extra layer of security (encryption) to prevent unauthorized access of your information. You could always do it yourself by typing the letter "s" after the http in your browser every time you signed in to FB, but in January FB added the ability to checkmark this setting in Account Settings so that it's automatic whenever you sign in.
You have to go to Account Settings and choose this option for it to take effect.
Once it's in effect, it will sign you on with the secure setting every time you sign in.
HOWEVER... each time you click on an app that says "you're about to leave a secure setting" and you click OK, your connection goes back to just plain (unsecure) http access in order to use that app. Once you're done with the app, you would need to go to Account Settings to restore the secure connection for the duration of your FB session, otherwise it stays non-secure until you sign out and back in again.
That wall post keeps going around, but is only partially true. FB does automatically have the non-secure setting... UNTIL A USER OPTS IN TO IT. That isn't a "change," it's been that way since they offered the option. Offering the option in the first place last January was the change!
Accessing apps that terminate the secure setting is being misinterpreted by some as FB changing their settings, when in fact the users themselves are choosing to do so by continuing on with an app after being notified that doing so will take them away from their secure connection. Or they never opted in by checking the box in the first place. I don't use many apps, but when I do use any that switch my connection to non-secure, I just restore the secure one myself after closing the app.
Using the secure connection may slow down the load time for FB pages and pics, but only slightly, and it's worth the trade-off, in my opinion.
