Does the fact compete.com constantly shows unique visitor tends for Google.com and Yahoo.com moving in near lock-step imply that overall Internet usage trends (or at least U.S. Internet usage trends) are moving in the same way? Or is it simply that compete.com’s algorithm become more flawed when dealing with super high-volume sites?

Is it possibly true that as goes Google and Yahoo, so goes the Internet? It’s seems unrealistic, but I’ve been watching this chart move for the last year and aside from Google surpassing Yahoo earlier this year, each month’s percent change is almost identical.