[NoodleIncident]

Facebook has claimed to have proved the opposite; at least in terms of political preferences, their study said that you're exposed to people of the opposite party more often online than you are in real life. I'm also not aware of any proof that algorithmic echo chambers are real, as compared with peoples' behavior offline. How many times do people check out a new author at a library, rather than more books from an author they like?

[cafard]

I imagine that one could do a thorough search without finding even a handful of MAGA yard signs in Takoma Park, Maryland, or Brookline, Massachusetts. No doubt there are many towns that have voted for no Democrat since LBJ, where Biden/Harris yard signs were hard to find.

I don't use Facebook, so I can't say about that. I don't really go on-line for political discussion at all.