Facebook is a fabulous way to stay in touch with family & friends and it has also become a useful communication tool for business. However, it is also a source of great frustration for users where a combination of advertising, scams and a myriad of posts from those same family members or friends sharing the things they are interested in. The clutter builds up quickly so you need to keep your Facebook News Feed tidy and make sure you have your security settings set to the highest level. Everyone is after your personal data so they can sell you products and services so you need to try and keep it down to a dull roar!
This advice controls what the world can see, generally speaking you want to share stuff with your family & friends and you don't want to share that same stuff with the whole world. So you lock down your privacy settings to suit