[thedragon4453]

IANAL, but in the US whether you actually hold a monopoly is the key. I think it would be bough to show that Google holds a monopoly in this space. They definitely command the biggest market share, but I'm not sure it would be enough to show that they have a monopoly. 65% (as reported here: http://www.foxbusiness.com/markets/2011/02/11/googles-lead-s...) is certainly the lion's share, but not quite a monopoly by US standards.

[mckoss]

I remember hearing that Google is making well over 50% of all Internet Advertising revenue in the US.

[vaksel]

it's in google's best interest to get studies to show them with lower market share. I'd bet if you tallied up the stats for 100 biggest sites, Google would have at least 90, if not 95% of all search engine traffic

[thedragon4453]

I doubt that just for the fact that IE comes with bing as default. I don't think enough people actually care to change it. I would not be surprised to see it higher, but I highly doubt greater than 80%.