googlesignGoogle’s share of the U.S. search market climbed to 67.3 percent in December, its highest point in nearly a year, according to numbers just released by the comScore research firm. The result was an increase of 0.6 percentage points from November, a notable jump in a market where monthly gains are measured in fractions of a percent.

Microsoft sites climbed 0.1 percentage points to 18.2 percent, but Yahoo continued to slip, falling 0.4 percentage points to 10.8 percent, according to the comScore numbers.

Combined, that puts the companies at 29 percent market share — up slightly from their combined 28.5 percent market share a year ago. Microsoft handles the underlying search technology and search advertising for Yahoo under the partnership between the companies. (Post updated with correct figure for Microsoft/Yahoo market share in prior year.)

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