Mail-in and absentee ballots, like these being processed by election workers in Pennsylvania, are a subject of misinformation spreading across social media.AP Photo/Matt SlocumKate Starbird, University of Washington; Jevin West, University of Washington, and Renee DiResta, Stanford UniversityWith no clear winner yet in the presidential election, there’s an opportunity for partisan activists, conspiracy theorists and others to exploit public uncertainty and anxiety to attempt to delegitimize the election results.A growing number of narratives alleging electoral wrongdoing have been spreading on…