Note “you” is the generic “you” not anyone in particular. Here “you” is the Facebook user and potential user.
Facebook shares (sells!) data with anyone who can write a check and buy it! How do you think they make their money? You are their product! In fact you’re the best kind of product. You are your own raw material. You are a self manufacturing product! You assemble your own “data” into a marketable data package yourself by using Facebook. Then you obliging sit on their shelves (The Facebook system!) awaiting customers to come by and make a purchase. Though I really can’t jump on Facebook to hard, it’s the same to varying degrees of granularity with everything you use and do the minute you connect to the internet - think metadata, use your cell phone, drive your car (In new vehicles OnStar-or something like it! is on whether you buy it or not!). All this media (including all social media sites!) data is collated, boiled down turned into a marketing data package that represents you. It is then bid on (yes bid on!) in a real-time virtual electronic market (I can’t remember the acronym now!) and sold so whenever and wherever you sign back into the Net-Verse the right advertisement appear, tuned to have a high probability to separate you from you money.
Government (and governments!) is a bit player in all this!
This has to do with money not ideology.
And if you like all that metadata collecting analyzing & bidding!
Just wait until we have the IOT -Internet of Things!
Everything in your house will have a microprocessor/radio and be connected to the internet. Soon the state-of-play of your Fridge, your pantry, washer /dryer and likely bodily functions will be part of that new “marketing John/Jane Doe data package” (Particularly if this Japanese web-connected toilet catches on !)