Mark Zuckerberg's Facebook testimony at Congress: Best social media reactions

Mark Zuckerberg's facing off with members of the U.S. government and the court of public opinion this week.

On Wednesday, the Facebook founder and CEO showed up for day two of his testimony before Congress regarding a data scandal involving Cambridge Analytica and the social media platform. 

While the 33-year-old Harvard graduate attempted to truthfully answer difficult questions from government officials, the Internet was hard at work on their best Zuckerberg memes.