does all of the websites start with google.com all belong to google?

[Muse]

If you are typing in the website address yourself and it starts with http://www.google.com/ at the beginning, it is affiliated somehow with Google.

HOWEVER - if you receive an email or something along those lines and the link says http://www.google.com) and when the user clicks on it, it redirects them to something else entirely. This is often used for spamming or malware so be careful and try to determine the source of the link.