driller41 - 8:24 am on May 16, 2012 (gmt 0)

Actually social bookmarks are a big spam link problem because of the number of automated tools endlessy creating these links - google always seemed to ignore these links, perhaps they are now actively devalued - I am not sure which.

But lets not get too obsessed with the idea that ALL links are bad which is the way people are thinking after Penguin.