For the first time on a routine week, Facebook has outpaced Google to become the most visited site on the internet.

According to research from Hitwise, Google’s share is still growing, but at only a fraction of the pace of Facebook.

The market share of visits to Facebook.com increased 185% last week as compared to the same week in 2009, while visits to Google.com increased 9% during the same time frame.

Together Facebook.com and Google.com accounted for 14% of all US Internet visits last week.

So what does this mean for marketers? Well, it’s a slap across the face — any marketer that is advertising on Google should put their efforts into finding a good Facebook strategy stat.

[Via Hitwise]