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No, we don't. Communities have bonds. Seeing facebook spam is not the same as talking to a person, and joining a group of people who post likeminded facebook spam is not a community. It just scratches the same instinctual itch as a community.You and I may be using Facebook differently. I'm not thinking about random Facebook groups and news feeds of people you don't even remember. But e.g. for me, there are people with whom, due to temporal and geographical constraints, Facebook (both site and Messenger) is the primary means of communication, and said communication is frequent and often deep. It's just another tool, not unlike the phone or telegram or paper mail.
> Understanding how and why people control information to manipulate the public and undermine democracy is important.
How: with free speech.
Why: because they have goals they want to achieve.
This actually is democracy working as designed - people being free to bullshit one another. The hope might have been that bullshitting from different actors will cancel out, but that doesn't generally work due to, among other things, simple randomness.