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All that may have changed – and BetUS offers you the bet it might have – in late May with Microsoft’s release of Bing.com, an alternative search engine locked into new Internet Explorer 6 browsers. Even with Microsoft backing the enterprise, though, how popular can a search engine David be against the Googliath? You might be surprised enough to pony up a bit.

That’s why they play with the big bucks, i suppose. Within 24 hours of writing this post on some seemingly too-long odds over at Paddy Power in the bookmaker’s intriguing “Highest-ranking social website by 2011” specialty bet came news from metrics specialist firm Nielsen Online of Twitter.com’s low rate of return visitors and thus justification to put fad-of-the-year Twitter, a website with over 1,000% growth year-on-year, at 9/4 odds in the proposition.

Paddy Power’s “Highest-ranking social website by 2011″ prop bet pits five ’sites against one another, but has the bookmaker unwittingly posted a super-easy wager?