then the source stepped forward. >> i believe facebook's products harm children, stoke division, and weaking our democracy. the company's leadership knows how to make facebook and inns that grant safer, but won't necessarily make the sanction because they put profits before people. >> haugen alleged that the company's own. >> reporter: showed the platforms can be toxic for children and for society at large. the ceo mark zuckerberg pushed back. haugen game new momentum to governments that want to rein in social media. that brings us to the number one media story of 2021. the vaccine disinformation divide. relionel info about covid-19 vaccines helped people get protected, but ape-vax lives