https://www.nature.com/articles/s41586-026-10098-2
“ Our findings demonstrate that the algorithm significantly influences whom users choose to follow, indicating that algorithms shape content exposure more than believed previously.
This mechanism may also help to explain why social media deactivation experiments, which completely disconnect users from such content, produce political effects, unlike merely switching off the algorithm while keeping users active on the platform.”

The political effects of X’s feed algorithm - Nature
Among users initially on a chronological feed, 7 weeks of exposure to X’s algorithmic feed in 2023 shifted political attitudes and account-following behaviour in a more conservative direction compared with those remaining on a chronological feed, whereas switching the feed setting in the opposite direction, from algorithmic to chronological, had no effect.