How do i put a lock on my facebook - Facebook Social Network

I used LEO Privacy to lock privacy app, like messages, facebook, whatsapp so that no one can open my app and see the content. Also home mode like the folder lock would give more privacy to the app itself. Super cool to protect your phone. LEO Privacy Applock Boost Hide Android Apps on Google Play

According to me LEO Privacy is the best and most trusted and download safeguard app to protect over 100 million users from private information leakage, with strong applock to lock up apps, convenient privacy scan to locate loophole, safe box to Hide private photo & video, Wi-Fi security to secure network safety, etc.When you don't want people to see your private things or unlock your apps, if they try to enter, the app will take a pic of the intruder, so you will find out who snooped your phone.
https://play.google.com/store/apps/details?id=com.leo.appmaster&referrer=utm_source%3Dseo3

LEO Privacy is super cool applock, it makes it so my parents and friends can't get into my Snapchat, Instagram, etc. when I'm asleep or not around they can't see my staff. best app ever for security!!!! LEO Privacy Applock Boost Hide Android Apps on Google Play

LEO Privacy is the best security app I've seen. It locks all apps that you don't want your parents going in to for example messages, Instagram and other various apps such as Facebook. I loved it especially it can also hide private photos and videos.

LEO Privacy can lock SMS, Contacts, Gmail, Facebook, Gallery, Market, Settings, Calls and any app you choose.
LEO Privacy Applock Boost Hide Android Apps on Google Play

You can try to download LEO Privacy. I can lock up my Facebook, WhatsApp, Clash of Clans, Messenger, Gallery and other important apps which may leak your privacy with LEO Privacy. And I can also customize my lock mode which allows me to lock different apps under different circumstances. CM is also a good choice, but I think it isn't smart enough~
LEO Privacy Applock Boost Hide Android Apps on Google Play

You can go to Google play store, there is an app that you can download that will secure your facebook. Just go to googleplay and type in facebook lock and it will show you all your options..Also you can and look up how to put a lock on your facebook and it will show you more options..Hope this helped..
Ellen

There is no 'Lock' exactly for Facebook apart from logging out of Facebook itself.
If you are trying to make Facebook more secure then you can set a second layer of protection by going into settings then security and then select a a way to make it more secure as everything on this page will help you do this, but the best would be 'login approvals' which make people logging into your Facebook account need your password and your phone to get into your account dramatically making your account more secure.