Back in August, Yahoo made headlines for being the top web property in the U.S. on desktop computers, based on data from comScore, which releases its report each month. That was the first time Yahoo sites beat Google sites in two years, and it didn't even include Tumblr traffic.
At the time, a comScore spokesperson said that it could just be a seasonal/month-to-month fluctuation, with the numbers being pretty close to Google's. In other words, Google could have easily gotten the top spot back the next month.
But that didn't happen. While the numbers may still not be too far apart, Yahoo has topped the list ever since.
The data for December is now out with Yahoo sitting on top once again:
According to comScore's report, Yahoo is also beating Google in the Ad Focus rankings (desktop only), though the companies come in at number three and four, with the top two spots going to AddThis and ShareThis.