Neither are threats to either. The only way google or facebook or amazon loses anything if they lose customers visiting their properties. Amazon isn't even entering google or facebook's domain.

This is just another in a long series of "i hate google/facebook/social media" propaganda pushed by the media on HN.

There hasn't been a day without an anti-google/facebook/social media post on HN for months now. You can use the waybackmachine to check for yourself. It's incredible.