If you had moderate political views, social media algorithms will try to feed you more and more extremist views based on what you are actually reading or have an interest on. This is just capitalism at work because the more time you spend on those websites, the more ad renevue for the platform. As a result those radicalization algorithms will probably push your moderate views to extremist views… So yes… Social networking are one of the main problems.
Meh. Pretty useless IMHO. There are plenty of tricks to apply after this basic stuff and even then, they will try to insert new telemetry on every small update. It’s now worth the fight. Try to switch to Linux mint and have a dual boot for relevant software like Adobe.