aristotle - 7:03 pm on Jun 16, 2011 (gmt 0)

Walkman -- I really don't know why Huffington Post would get a rankings boost. Well, I did read somewhere that its writers are encouraged to use keywords in the titles and first paragraphs of the articles, so that might have helped. At any rate, I think that the +1 and Block features are too new to have had much effect in their case. I'm more concerned about smaller one-focused-issue sites anyway, because I think they will be the most vulnerable.