It appears that in December 2009, the 112 of the comScore top 1000 sites that were entirely or partially measured by comScore’s hybrid methodology saw on average a 30% increase in unique visitor counts. Some of the largest discrepancies appear to show up with sites that tend to get more traffic from areas where the [...]

The following comScore data show that US consumer traffic to Google, Facebook and Youtube have mushroomed since September 2006 from 2.7% of all user time spent online in the United States to represent as of August 2009 approximately 14.1% of all user time.
In addition, you can see that over this time period the average number [...]