George - 1:50 pm on Apr 18, 2012 (gmt 0)
arikgub, that theory looks familiar... and might hold water. Or partially. It would tie in with the messages they are sending too.
My guess is the anchor text must have been heavily skewed though for it to impact 12 months ago.... or if it got alot at once, then I have seen sites tumble on phrases because they do not keep up the level of new back links.