Edmond Lau, current engineer at Quora and former software engineer at Google, said the following about search engines using clickthrough rate and visit data in February during the Bing debacle:

Interpret that how you will, but I think all signs point to yes. Also, thanks to Rand Fishkin for referring me to this article.
For those active on the blue bird, I’ll be on #SEOChat talking about Scalable Link Building at 6PM PST on Thursday.
