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Last Monday, released the January ’09 numbers for the top 25 social networks.

I decided to have a closer look at those numbers and compare it with the numbers from another audience measurement company: Quantcast

As you can see from the two images below, there is a big difference in the numbers from Quantcast and Compete. uses a U.S. based panel for its reach estimates. Quantcast uses an inference-based, direct measurement methodology. Quantcast also offers a direct measurement solution for web site publishers.

I’ve been using Quantcast for about 18 months to measure my own web site performance and reach on a U.S. and global level. My Quantcast profile can be seen here:

You can click on the images for a larger view…

The last column in those images shows the rank by the other measurement company. Top 25 Social Networks - Jan '09 (credit Top 25 Social Networks – Jan ’09 (credit

Quantcast Top 25 Social Networks - 30 days (snapshot taken Feb 10th, 2009) (Credit:

Quantcast Top 25 Social Networks – 30 days U.S. traffic (snapshot taken Feb 10th, 2009) (Credit:

If you’d like to get the Excel file with all the numbers, then please click here.

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