Comment by AlexandrB

Absolutely. In two specific ways:

1. There's often little or no visibility on how this personalization happens. People with often try to guess and steer the algorithm but the reality is you don't know. This means that unpopular opinions can be quietly suppressed with no detectable censorship. On the poster/creator side this presents as constant paranoia about "shadow banning" and the like.

2. The personalized feeds are effectively endless. This allows for repetition that really amplifies any biases/fears. For example, suppose you're worried that the roads are getting more dangerous and you go on Instagram and start looking at car crash reels. Instagram will happily feed you as much of these as you can stomach and it starts to affect your perception of reality. Never mind that you're looking at incidents captured over a period of years from all over the world, seeing them all back to back will probably give you anxiety the next time you go to cross the street. Now apply this same logic to any political topic...