Yep I was surprised this too http://www.revolutionmagazine.com/DigitalPM/News/919125/Bing-bigger-Twitter-i…
But take it with a huge pinch of salt for how many people using Twitter is anyone’s guess. Web tracking agencies only gauge people using the Twitter.com and not using apps like Tweetie., Tweetdeck and Seesmic. Also a lot of site tracking companies don’t include people using the web at work or at college, which is a huge chunk to ignore.
Also, if you haven’t changed your IE home page you are getting BIng by stealth anyhow.
Yet as Paul at TechDigest reports here http://www.techdigest.tv/2009/07/bing_gets_more.html is is gaining momentum but has a long way to go before it catches up with Google.
Anna at Shiny Shiny did a quick comparison of the two search engines here http://www.shinyshiny.tv/2009/07/bing_-_why_you.html