Just found a Daily Mail article (dated) that seems to suggest facebook is now going to track non users in an attempt to send advertising to them,.
This is even more reason to start using adblockers for example. There are also tools such as umatrix which I have discussed on the Tech Jam website,
This can help you block websites that other sites connect to OR once identified block at the router level. There are also sites that connect to servers such as connect.facebook,net, As end users you should challenge these sites to explain WHY and if they can’t give a satisfactory reason (or just ignore you ) block those sites and get them blacklisted.
You can find out more about adblock from here.
If you need social media try decentralised services such as https://diasporafoundation.org/