Google Watch : Google's Search Lead Widens, Reaches 50 Percent

Google Watch : Google's Search Lead Widens, Reaches 50 Percent: "Google accounted for a majority of all the Internet searches conducted in April, Nielsen/Netratings found in a report issued last week that may as well be a coronation.
This report, and another from ComScore that had Google at or near a majority, if anything shows that Google's Internet search market share lead may be insurmountable, in the near and distant future."

What are the official criteria for monopoly status these days?...