boris_holzer, 
According to recent studies, algorithmic and social amplification of social networking platforms doesn't seem to have great effects on political attitudes and polarization. But if the algorithm is turned off, users find the experience less interesting. A short summary:
https://www-faz-net.translate.goog/aktuell/wissen/geist-soziales/die-digitalisierte-oeffentlichkeit-im-griff-der-sozialen-medien-19111824.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en
[autotranslated]
https://www.faz.net/aktuell/wissen/geist-soziales/die-digitalisierte-oeffentlichkeit-im-griff-der-sozialen-medien-19111824.html
[in German]Link to articles in Science:
https://www.science.org/toc/science/381/6656