Now Playing: How Facebook and Google helped Donald Trump win the White House Now Playing, How Facebook, Google and Twitter helped Donald J. Trump win 2016 Now Playing What’s the difference between Facebook and Twitter?

Now Playing Trump administration asks US senators to review Facebook privacy policies Now Playing President Donald Trump asks US Senate to review Twitter privacy policiesNow Playing Facebook is pushing back on Russia allegationsNow Playing The latest: Russia denies involvement in hacking election Now Playing The best memes from the Trump eraNow Playing ‘Myanmar’s Rohingya refugees are fleeing from ISIS,’ CNN’s Paul Carrel says Now Playing How President Donald J.’s Russia-Russia investigation has played outNow Playing Trump and his advisers say US intelligence agencies are biased against himNow Playing What Donald Trump’s new foreign policy adviser is saying about RussiaNow Playing How Trump administration plans to deal with Russia