In the year since the 2016 Presidential election, the influence Russian agents had through social media platforms on the outcome is still under scrutiny. Last month, representatives from Google, Facebook and Twitter testified at a Senate Intelligence Committee hearing about what they knew and how practices will be updated for future elections.

California's freshman Senator Kamala Harris had some choice words for leaders of the tech companies as she has faced Russian Twitter trolls of her own. Sacramento Bee columnist Dan Morain joins social media expert from Andy Jones from UC Davis discuss.