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VC blogger Fred Wilson gives Google and Yahoo too much credit: He's taking their "Inbox 2.0" initiatives to turn Gmail and Yahoo Mail into social networks seriously. He 's put together a chart comparing the "social graphs" — we think he means "number of users" — of some popular social networks versus Microsoft's Hotmail and AIM.com. Wilson estimates that Yahoo and Google, which aren't actually on the chart, have about 250 million and 60 million users. Here's the chart.

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