The Realtime Web is a hard thing to measure because it doesn’t exist only on traditional Web pages. It also exists in stream readers and desktop clients and mobile phones. And it is not just Twitter and Facebook. It is also bit.ly and TweetDeck and Seesmic and Tweeite and realtime search on Google and Bing, and the list goes on and on. So while we can look at comScore and see that Twitter.com in the U.S. was still flat in December, 2009 with 20 million unique visitors (up slightly from 19.4 million in November), that doesn’t account for the overall Twitter ecosystem or the larger [...]

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