The only thing that has changed is that the power that used to be in the hand of the press and those with access and control of the press is now in other hands and in some ways more transparent.
A lot of the people yelling about the power of social media giants now are yelling because they represent the old status quo, not because they want democratisation of thought.
People choose which press to go to based on what they thought of the information provided there. People choose social networks based on which people are on them. Social networks controlling what you see is therefore much more dangerous than newspapers controlling what you see, since if you don't like what you see in a newspaper you can just switch but if you don't like twitter removing your posts most of your reasons to stay are still there.
A lot of the people yelling about the power of social media giants now are yelling because they represent the old status quo, not because they want democratisation of thought.