As many as 126 million people saw social media ads purchased by the Internet Research Agency, a group linked to Russia, during the 2016 election cycle.

Lawyers for Facebook, Twitter and Google have been testifying before the U.S. Senate about possible meddling in the election by Russian agents.

A local social media expert says social networking sites and platforms could always do more to educate users about what they’re seeing and where information is sourced.

“There has to be transparency, at some point, on social media advertising. There’s just no way around it,” said John Jiloty, social media director for Buffalo-based Martin Davison Public Relations.

“It’s tremendously unfair to the people that this stuff’s getting out there and it’s not being made clear who is behind it,” he said.

Mark Zuckerberg, Facebook’s CEO, says his company intends to double its online security by the end of next year and will identify and remove repeat offenders.