When did Yahoo Answers launch related questions?

It's interesting that over the 4.5 years FunAdvice has been around (yep, we'll be 5 years old in 2008) we've been copied by:
Yahoo Answers
Answerbag
Yedda
Askville
Live QnA

Basically, all of the large well known Q&A sites have lifted ideas, user interfaces, and more from the implementation they saw on FunAdvice. Or, we all had the same idea, at the same time :)


So today, I'm in a very interesting position - who came up with related questions first, Yahoo Answers, or FunAdvice?

Not the Yahoo Answers implementation.


Now, take a look at the FunAdvice implementation.

What's interesting to me is that we both seem to have about the same number of links in the module, the same placement, etc. I know that we launched ours on August 25th to the public, and had the mock with this integration internally as of May, 2007. When did Yahoo launch theirs, did they copy us? Or was it serendipity?