Yeah, when it comes to tracking data of non-users, Google takes the trophy on that one easily.
Almost every website nowadays have a Google script tracking it's visitors across the Internet.
When I search on amazon.com for clothes etc.. and then when I am on other websites, I see google ads for clothes on amazon (maybe other online stores also). I think this is cheating and illegal for internet marketing.
And if we only knew what kind of information they take from your Android phones...
Few years ago Microsoft was very scary as Windows was most popular operating system, now most popular operating system is Android which is developed by Google and comes with Google apps with full system access and closed source.
I used to try convince people to switch to Linux so Microsoft doesn't have full access to their personal computers where they had a lot of personal information.
Now we have these computers always in an arm length and there is no good open source alternative. They are next to us while we are walking outside, while we are eating, sleeping, practically always...And it is all owned by the company that also owns majority of the Internet...
When it comes to privacy, we are in deep shit now, if we ever where.