Even without algorithms it is happening because people silo onto different sites. The real problem though is when people are in altered realities. When censorship on one platform is able to make a mob of people completely unaware of inconvenient reality with no hope of them finding out, then those mobs become dangerously stupid.
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The real problem though is when people are in altered realities. When censorship on one platform is able to make a mob of people completely unaware of inconvenient reality with no hope of them finding out, then those mobs become dangerously stupid.