Be aware of links or videos that take you away from Facebook and prompt you to login to view content.
These are known as “Phishing Scams” with the intent of stealing your login details in order to hack your Facebook account.
Often these websites will look much like Facebook see images below…
You will find none of the other Facebook features work on these fake pages and the url (website domain) in the address bar will not be Facebook, the spelling will be incorrect or additional letters or numbers added on (as in the example images above).
Always be vigilant when you are taken to login pages via Facebook.