CEOs of Facebook, Twitter, Google face new grilling by Congress

As malicious conspiracy theories continue to spread, lawmakers are pounding the social media companies over their market dominance, harvesting of user data and practices that some believe actually encourage the spread of engaging but potentially harmful misinformation.

Twitter CEO's 1st tweet sells for $2.9M

Twitter CEO Jack Dorsey has sold a digital version of his first tweet for more than $2.9 million more than two weeks after he announced a digital auction for the post.