It has been confirmed by the White House that Facebook and Twitter influenced the election results by utilising echo chambers and fake news to their advantage:
Trump digital director says Facebook helped win the White House
The Trump presidential campaign spent most of its digital advertising budget on Facebook, testing more than 50,000 ad variations each day in an attempt to micro-target voters, Trump’s digital director, Brad Parscale, told CBS’s 60 Minutes in an interview scheduled to air on Sunday night.