Facebook is not just a means of communication, lol.
Facebook and it's associated cookies, along with Google, pretty much keep a record of everything you do online, and your shopping habits. Any website that is offering 'free' anything. Whether its free videos, free uploads, free 'communication' (WhatsApp, FooTalk, Snapchat, Viber, Facebook, Twitter, Youtube, etc.) , free downloads, free online shopping (ie. Paypal, Amazon, etc), and even I wouldn't be surprised free online banking, if your Bank or Credit Card company, is going to be analyzing your shopping, browsing, eating, and/or internet use.
Since Facebook and other forms of social media proves many people are narcissists and will easily give away their privacy for the chance at popularity and peer approval, we're making advertisers, stalkers, investigators, and big brother's life very easy. If you want to keep your personal life and activities private, good luck living in this modern age.
As long as you aware and accept that this is the new status quo, you can use Facebook for 'communication' purposes, lol.