As of now, you can block a lot of things, the majority of it in fact.
Facebook and the like does gather information on you, whether it knows your name or the information is just linked to a MAC or IP address, maybe even
your phone number. It has over 500 data points it utilises and multiple companies are used for data mining. The data is useful to them whether they
know who you are or not.
I had to sign up to FB so I could message a particular business, it suggested nothing of relevance to me. All it knows is my IP address, and it cannot
link that to anything. I have blocked all FB "bugs" in my browsers for a very long time. Of course I cannot block all of the data that the other end
receives, such as my IP (unless using a vpn). I do however change my browser user agent (identifier). For all intents and purposes, I am feeding it
Please note, I have absolutely no affiliation or connection to these two addons.
I use uBlock origin and Ghostery to block the FB and so on's web bugs. If someone asks, that is what I suggest. Do not enable or use prediction or
reputation services, that sends every URL you visit to the provider.
I also suggest you look into your antivirus program. The majority of them harvest a LOT of data on you and some sell it. They see every URL, they use
"silent detections" which take files from your pc and scan them. They want to fingerprint any file of interest. (No wonder Kapersky has been accused
of passing data to the Kremlin)]
They have access to everything, they are trusted due to history but nowadays they cannot be trusted. Cui bono.
I personally contacted a lot of antivirus software companies after
finding a document by AV Comparatives on the privacy of AV
and I found only two protect data, allow full opting out or simply don't collect it at all. They were Emsisoft and Ahnlab's offerings which
are not officially sold in outside of South Korea.
I recently purchased a new phone, I looked into particular makes and models and found every single one has spyware in the guise of "user improvement
programs". I actually busted and confronted Lenovo over their "reaper service" on my new tablet, within 2 days they had moved it and also added it to
the desktop sync app. They told me that nobody had complained so it's all ok. The "feature" harvests name, address, gps coordinates, all recently used
software and more and sends it unencrypted to Lenovo in Singapore. I found the file, changed the details, sent it, then blocked it. The file itself is
not even encrypted on the device which is disgusting.
This crap is everywhere.
You have no privacy but that which you create and protect yourself. It is possible, unless you are actually targeted, then you stand no chance. Let's
be real, most of us are of absolutely no interest to tptb, and that's a good thing.
Good luck, it's an uphill battle, but worth it. It can be done, you can be largely anonymous and on the grid.