Let's start with Google: It is a search company. It's purpose is to give people those search results that the people want to see, meaning the results that they click on. If Google News gives you too much politics, it is because either you yourself, or the average person is clicking on those results more frequently. There is some way to tune Google news to emphasize certain sections over others, or to weight them, but I don't know the details (found it once, adjusted what I liked and disliked, reduced sports, turned off entertainment, increased international politics, and then forgot how to adjust it). Do some web searches for it.
One particular aspect of social media is that much of it is simply a 1-on-1 communication mechanism. These days, the communication techniques I use include face-to-face meetings (like driving over to a neighbor), paper letters (those are getting to be very rare and used for formal occasions, like legal proceedings), landline phone, cell phone, e-mails, and an insanely large variety of instant messages / voice / video calls, including at least cell phone SMS, Facebook Messenger, Skype, Google Hangouts, WhatsApp, Apple iMessage, Facetime, and so on. And some of those work better than others in unexpected places. For example, a few weeks ago I was in a strange foreign country, but staying in a nice hotel with good WiFi. Long distance calls to home were very expensive, and had bad voice quality. So instead I used Facebook Messenger calls to talk to my wife, and sometimes even Facebook video calls 3-way with my son and my wife.
But that meant that my wife had to create a personal Facebook account (she only had an account she used to care care of the Facebook page of some work-related stuff). So now she is a Facebook "user", in the sense that she has an account, with nearly nothing posted.
Social media, and in particular Facebook and LinkedIn, are a two-edged sword. As described above, to some extent they are simply a necessity: you have to sign up, just to use their free and very useful messaging / communication mechanisms. I actually have quite a few friends that I can ONLY reach via Facebook Messenger, or via LinkedIn. While I fully expect Facebook / Skype / WhatsApp / Apple / ... to listen to my personal communications, I don't care: The NSA is listening to all my phone calls too, and privacy of communication is unfortunately a thing of the past. If I really need to have a conversation that I expect others to not see, I either meet with them in person (with my wife, my manager, my doctor, or my lawyer), or I send a paper letter in a sealed envelope.
The other useful feature of things like Facebook is as a replacement for closed e-mail lists. For example, a few months ago a group of about 20 friends found themselves having been kicked out of their favorite discussion forum (for reasons of power struggle among administrators of that forum). We had no place to connect. What did we do? We quickly created a secret and closed Facebook group. Took less than a few hours, and we were communicating again.
The public features of Facebook and friends are not all that bad, if you use them correctly. I post things there. When I do, I first think about what I want the whole world to see about me. My political views? Hardly. My preference in drinks, cars, and such things? Only if I really want to. My profession? Not at all. I do post pictures and texts about my hobbies there.