While that may be true. The filter bubble is also a very real thing.
Social media sites earn their money by your attention. And try to keep it as long as possible, with all the tricks in the books, and some they invented.
So when someone belives something. They search about it. And belive they have done research. When they find what the site belive keeps them engaged.

Want to know more? sorry, been playing to much helldivers 2. ;) https://www.ted.com/playlists/470/how_to_pop_our_filter_bubbles

The science is not conclusive tho. Perhaps i am in a bubble… messes with the head…