Twitter Founder

Experts Skeptical of ‘ISIS’ Threats to Facebook, Twitter Founders

Mark Zuckerberg at a preview day of the the Mobile World Congress in Barcelona, Spain, Feb. 21, 2016. Alberto Estévez/EPA (ABC News) — A group of pro-ISIS hackers this week threatened the founders of the world’s largest social media sites, Facebook and Twitter, by posting a video online showing the faces of cyber CEOs Marc Zuckerberg and Jack Dorsey riddled…