In this way, you could say that "Facebook Controls [a significant portion] of the Media in America"
A term like "media filter" only has value in distinguishing between "traditional" media and companies like Facebook. But, strictly speaking, Facebook is as much the media as traditional outlets and, in this context, those outlets are merely sources for Facebook.
With 2 billion viewers / readers / listeners.
That Facebook is a media channel?
That it doesn't in fact have 2 billion MUA, as claimed?
https://techcrunch.com/2017/06/27/facebook-2-billion-users/
That some other channel is more significant?
That there is another information channel to which a similar number of people dedicate 50 minutes of attention to daily?
https://www.nytimes.com/2016/05/06/business/facebook-bends-t...
"I don't think" is ... a rather weak level of substantiation.