Facebook's research on teens and mental health is not as conclusive as it appears, relying on teens' self-reported views and a small sample size (Anya Kamenetz/NPR)

Anya Kamenetz / NPR:

Facebook’s research on teens and mental health is not as conclusive as it appears, relying on teens’ self-reported views and a small sample size  —  On Tuesday, Facebook whistleblower Frances Haugen testified before a Senate panel.  The hearing’s focus was advertised as “protecting kids online.”