Celebration of Facebook and dejection of facebook

Facebook was connecting everyone to everyone. But it influenced US presidential election and the Brexit referendum of UK. As quiz data from facebook was used to create profile traits and show the users those  features which would influence their minds. Its mind boggling. How we are being influenced. Facebook CEO blames it on the firm Cambridge Analytica which processed all this after taking permission from Facebook. Can they do this, where is the line of division between what we "can think on our own" to"what we are made to think"
Its computer age and when we give our data away to facebook we have given our mind away too. These are challenges to democracy. Can there be democracy with this kind of influences