Shareholders call on big advertisers Omnicom and Home Depot to investigate whether Facebook, Google, and Twitter's ads fuel violence and hate speech

Facebook, Twitter, and Google have banned President Trump and accounts supporting QAnon and the "Stop the Steal" misinformation group while pausing political ads until after President-elect Biden's inauguration — but some interest groups want Omnicom and Home Depot to pressure them to go further.

Investors in those companies, two giant ad spenders on those platforms, filed resolutions in December calling for outside investigations into the tech giants' ad policies.

Nonprofit Open Mic led the efforts on behalf of The Nathan Cummings Foundation, which owns shares in Omnicom, and Myra K. Young, who owns shares in Home Depot.