Martin_Ice_Web - 3:45 pm on May 17, 2012 (gmt 0)

But there are differences between adding -amazon.comm and -anydomain.com.
For my site this means, adding -amazon.com -> prepenguin results,
adding anydomain.com -> better but still penguin results

It seems like if the added domain suppresses something like a niche penalty/filter.
Like if keyword matches amazon _-> #1 amazon #2-#9 brands etc.
if amazon is filtered -> prepenguin