Falsehoods claiming migrants in Ohio are killing cats and decapitating ducks went viral this week. The Trump campaign embraced them.

President Biden, who has been sidelined with Covid, is set to address the nation this week.

Some far-right commentators have long argued that Democratic Party elites were plotting to replace President Biden. Now those commentators say they’ll be proved correct.

Christopher Blair, a renowned “liberal troll” who posts falsehoods to Facebook, is having a banner year despite crackdowns by Facebook and growing competition from A.I.

In the hands of anonymous internet users, A.I. tools can create waves of harassing and racist material. It’s already happening on the anonymous message board...

A 24-year-old’s sudden death devastated his family — and caught the attention of the movement of vaccine opponents.

A wave of regulation and industry action have placed the flourishing fake review business on notice. But experts say the problem may be insurmountable.

The candidate for the Democratic presidential nomination uses logical leaps and rhetorical devices to create false or misleading messages.

A new generation of chatbots doesn’t have many of the guardrails put in place by companies like Google and OpenAI, presenting new possibilities — and...

As election activists rally against new voting machines, they are drifting into territory now dominated by conspiracy theorists.