I do not necessarily see the harm in Google, they contribute lots to our economy and have provided us with some of the most groundbreaking software as of late in the computer science field. Facebook seems a little sketchy but they are the smallest company on this list so if you don't break up Google and Amazon first then you can't breakup Facebook. I believe Amazon being the largest company on this list should have its powers limited. Right now Amazon Web Services controls almost half of the infrastructure-as-a-service sector and can control significantly who gets to use the internet. If they keep growing and taking more market share then they could become the gatekeeper to the internet.