Also mentioned on replies to that tweet was that maybe google.com doesn't have newsfeed functionality like facebook. But youtube does. And the personalization of search results based on your profile can also have similar effects.
Considering most search queries are simple and apolitical, I feel the argument "tailoring search results is less dangerous than curating a news feed" has some merit.
That aside, if you use Google as your main news outlet, all that goes out the window.
