I don't understand the problem, you can use Facebook for adding friends and messaging them and it's free. You can use Facebook Messenger, not use the app and use website for adding people and getting their information. The newsfeed there can be turned off or customised, if you do install the app, all notifications can be turned off. This is a good and free service, but if people don't know hot to use it, maybe there is a point in writing about it. Messages about deleting Facebook account seem counterproductive, because why throw away a good tool if you use it rarely and it's useful?