Opinion: It’s time for social networks to take a close look in the mirror

Kara Alaimo, an associate professor of public relations at Hofstra University, is the author of “Pitch, Tweet, or Engage on the Street: How to Practice Global Public Relations and Strategic Communication.” She was spokeswoman for international affairs in the Treasury Department during the Obama administration. Follow her on Twitter @karaalaimo . The opinions expressed in this commentary are solely those of the author. View more opinion at CNN.

(CNN) Senators grilled executives from Snapchat, TikTok and YouTube on Tuesday about how their platforms impact young users. Asked how their platforms affect the mental health of teens and even promote eating disorders, the representatives all said they don’t allow such content and instead point users to expert information.