Few "go to Facebook for news"
But a lot of people go to Facebook, and once there if there is news they may read it. Either because it is news they hadn't seen elsewhere yet, or because they don't make any effort to go anywhere for news so what they see on Facebook is nearly 100% of their news consumption.
I read news linked off Facebook, either because one of my friends shared it, or because it is something interesting I hadn't seen that one of my friends interacted with (like my angry libertarian friend who lives in a Chicago suburb, she's always complaining about the taxes in Illinois on posts from WGN or the Tribune...makes me wonder why she doesn't move!) I certainly don't go there for news, but I do consume some while there - even if one never read a single article the way headlines are written can influence people and you can't help seeing those as you scroll your feed.