Busting up these four is a Progressive response to a perceived non-problem.
Every firm has 'spied' on you in some way, for years. The level of spying hasn't increased, just the methodology of it, which seems to make it more dangerous. But it isn't. These firms only want to sell you stuff, and there are ways to limit what they know about you (it's time consuming and will make your online experience more difficult at times, but if it bothers you, take steps). More importantly, what each firm knows about it is often at odds with what the others are trying to learn (not always, but remember, they are all in competition). So they compete with each other on information, too.
The REAL scary part is how deeply rooted they are into the Democratic Party and how they stifle anything which is disagreeable to their companies' 'core principles'. Zuckerberg is a megalomaniac, and I'd say quite insane, but his workers love him. After all, he made them rich. So if he says he "Cares about the world and society" they believe him (plenty of my friends work for Facebook).

Facebook, I've noticed is something people tend to question. I don't. It's a sharing device. Some people overshare - that's their right. It's easy to not have a filter. As an introvert, I've found Facebook useful because it allowed me to reconnect with old friends and family and share experiences and stay in contact. Several friends sent me thank yous for sharing my Super Bowl experience, it enhanced their enjoyment of the overall event.
On the other hand, Facebook congratulated me yesterday for getting 41,000 "likes" on my profile over the years. I posted this and pointed out that Facebook, in their congratulatory email, said I was making the world a 'nicer, more positive place by promoting likable material'. I then took it a step further and showed how Facebook is out of touch, because if I was posting commentary like "kill baby rabbits" and people were liking it, that's hardly moving society forward. Facebook has a bizarre and unusual approach to society-building.

So does Google.

Which is, ultimately, why they will fail someday. Something better or different will come along. It always does.

As for the "spying", the REAL problem isn't what THEY are spying for. It's that the government is deeply embedded in what they do. The government is the real bogeyman here, not these companies.

The government claims they need backdoors to all their data and monitoring. In some cases, they already have it, but still want more.
The government is not our friend, no matter how much we want to believe it. So when we talk about the damage these firms can do, it's not a result of their size or their 'spying', it's how closely aligned they are with government. This alignment is the one thing which may help extend their lifespan beyond a reasonable time frame. The only monopolies which survive over time are those with government protection. As long as they go along with government's wishes, their monopolies are safe.

The reason they hate Trump is because he's offered no guarantees, even as his administration has continued milking these information cows. Facebook showed some cracks in its veneer last week. Google has already shown a few, as well. Amazon is still in its infancy (it only owns 3% of all retail, at this point), but Bezos isn't stupid. He knows he needs Progressives in office to help him destroy competition.

Leave them alone - just don't give them any guarantees.

By the way, one thing about most of the data they collect? It's really only good for about 3-6 months, depending on the person. People's tastes and behaviors change significantly over short periods of time. Most data firms are constantly farming data for one reason - it changes so fast. No firm will ever have a complete monopoly on who you are.

Whether you choose to use them or not - it really doesn't matter. Even if you don't use Facebook, it still tracks you. Since almost every page, particularly news or information, has a "share" or "like" button, Facebook collects data from these about who is visiting. You don't have to click them. You just have to have a full cache of cookies and a URL history, and it's easily accessed. Your browser 'fingerprint' is also very easy to pick up. Google collects data in the background through Google Analytics, too.

Using their pages? Secondary. There are always ways to get the information you need.