Does Google hold a monopoly on the search engine industry?

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I'm sure that most of you have used Google. I would also be willing to bet that most of you have used Google today. The fact is, the Google corporation has their hands in almost every aspect of Internet marketing. Email, Maps, Google Earth, Google Docs, Google Goggles, Google Images, and of course Google Search are just a few of the many flavors of Google. So, given that Google is currently the largest internet company in the world, do you think that they have a monopoly on their industry? Please explain your viewpoint thoroughly to ensure that this is a good, intelligent discussion.