For many parents, revelations this week from whistleblower Frances Haugen showing internal Facebook studies of the harms of Instagram for teenagers only intensified concerns about the popular photo sharing app.

"The patterns that children establish as teenagers stay with them for the rest of their lives," Haugen said in Senate testimony Tuesday.

"The kids who are bullied on Instagram, the bullying follows them home. It follows them into their bedrooms. The last thing they see before they go to bed at night is someone being cruel to them," Haugen said. "Kids are learning that their own friends,...