AdvertisementFacebook's Russia Ads Could Be 'Tip Of The Iceberg,' Warns Senate Intel DemSeptember 07, 2017Ryan LucasfacebookEmailSenate Intelligence Committee Vice Chairman Mark Warner, D-Va., who is leading the Senate's investigation into Russia's election attack, said Thursday he has long believed that Moscow used social media sites like Facebook and Twitter to intervene in the 2016 election. (AP)