Social platforms say it's hard to tell which users are kids

Tech giants including Instagram are calling for Congress' help in figuring out just how old their users actually are.

Why it matters: In order to create child-friendly experiences, online platforms need to identify which users are actually children.

Driving the news: Instagram head Adam Mosseri became the latest industry leader to highlight the challenges of verifying the ages of users at a hearing before the Senate Commerce consumer protection subcommittee on Wednesday.

Children under 13 aren't allowed on Instagram, but Mosseri told lawmakers it is very difficult to verify ages on the...