Google passed Yahoo in its share of monthly visitors in the United States for the first time this April, buoyed by growth in search and YouTube videos, according to ComScore statistics released Thursday.
However, underscoring the variability of this sort of measurement, which extrapolates overall data from the usage of a "panel" of users at home and work, ComScore rival Nielsen Online released its own data as well with some different results. Although it also showed Google as No. 1 in terms of unique users, it said Google passed Yahoo way back in January 2007.
ComScore said Google … Read more