I have recently started using the Tor Browser when browsing Facebook and Twitter (although I need to get into the habit of doing so consistently). Amongst other things, Tor can help to protect against IP address tracking (although it is not bulletproof!). I find it unnerving that Facebook and Twitter are able to discern who my housemates and officemates are, even if I have had almost no interaction with them. (I don’t mind being associated with my particular housemates and officemates at the moment, but some people may mind that.)
When you click on outgoing weblinks on Facebook, they do not directly take you to the desired website. Instead, they take you first via a tracking page: note the URL at the bottom:
This intermediate tracking page allows Facebook to know what links you have clicked on, at what time and in what context. (A browser doesn’t send this information to the webserver of the page containing the link.) To partially overcome this, I give the full URL when posting a link. A reader can then copy this URL and go to it directly, skipping the intermediary.
Since many users are not aware of Facebook’s outlink tracking, it should be considered a form of clickjacking.
These practices are a start, in lieu of managing to persuade one’s friends to migrate to a more private (and oftentimes more open, somewhat ironically) platform. Of course, Facebook may still harvest information about me, including anything I post, the things that I click on (or not click on), and anything said about me by other people.
By the way, you should care about privacy even if you are not a criminal and have ‘nothing to hide’. That claim is patently false: we all have secrets which we would like to keep, even if they are not illegal. Society has stigmas, and an unscrupulous government or employer could use its illicitly-obtained knowledge about your relationship, which you might like to keep quiet about, to blackmail you. And while it’s unlikely that any Facebook employee would personally be interested in your life, the psychological profiling that they may obtain from tracking your cursor could be very lucrative for an insurance company. And, of course, we often talk about other people behind their backs, in unflattering ways.