Murphy Bannerman first noticed the posts this summer in a Facebook group called Being Black in Arizona.
Someone started posting memes full of false claims that seemed designed to discourage people from voting.
The memes were "trying to push this narrative of, 'The system is a mess and there's no point in you participating,' " Bannerman said. She recalled statements such as, " 'Democrats and Republicans are the same. There's no point in voting.' 'Obama didn't do anything for you during his term, why should you vote for a Democrat this time around?' "