According to the latest Hitwise analysis, Google’s lost its crown as the most-visited Web site in the U.S. last week. The new king of Web site traffic is, of course, Facebook. In the future, technohistorians may marvel at this event.

During the Winter holidays there were a few momentary spikes in traffic which placed Facebook on the top, but if you check out the graph of the long term trend shown above, you can see Facebook’s meteoric rise is now on target to meet or beat Google. And if that curve continues on its trajectory, which it may well do for a while (its market share is 185% up over the same week in 2009, for example,) Facebook will become number one by a huge margin, versus the tiddly little 0.04% separation it currently has above Google’s 7.03% share of average weekly market share.

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