Yahoo-Bing Stat Fight: Nielsen Says “Oh Yes They Did,” comScore Responds “Oh No They Didn’t”

How can Nielsen say Bing has overtaken Yahoo while comScore reports that Yahoo grew and leads Bing by more than 6 points? Someone is right and someone is wrong.

Here is the Nielsen data from earlier this week, showing Microsoft/Bing overtaking Yahoo:

And here is the August comScore data (reported by Citibank):

  • Google: 65.4% (down from 65.8% in July)
  • Yahoo: 17.4% (vs. 17.1% in July)
  • Bing 11.1% (vs. 11% in July)

The comScore data show Bing as flat, not growing. The combined share of Bing and Yahoo is 28.5%.

Among the firms that track search market share Nielsen is the outlier right now. I’m going to ask Nielsen how to explain the discrepancy in the data between the two firms.

In the meantime, how would you explain it?

Related Topics: Channel: Strategy | Stats: comScore | Stats: General | Stats: NetRatings | Stats: Popularity | Stats: Size


About The Author: is a Contributing Editor at Search Engine Land. He writes a personal blog Screenwerk, about SoLoMo issues and connecting the dots between online and offline. He also posts at Internet2Go, which is focused on the mobile Internet. Follow him @gsterling.

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  • Tim Cohn

    Nielsen doesn’t reconcile its data.

  • Michael Martinez

    Different strokes for different folks. None of these metrics services provide any search measurements worth paying for. They’re all looking at the obsolete metric of page views (a metric no self-respecting SEO would ask a client to pay attention to today).

    What they should be reporting is the number of referrals the search engines make to other Websites. That is the only metric that really matters to the advertising and search-based business community.

    Who cares how many Google page views Google visitors generate as they click around Google’s system? Sure, they’ll see ads, but they’re clearly not clicking on those ads.

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