I have many yahoo answers pointing to my money site. All this backlinks are of course nofollow but I think they are important for Google because of the very high authority of Yahoo. In effect, I can see all my yahoo answers backlinks on my Google Webmaster Tools. 1) I wonder if can be useful to build tier2 (and tier 3, I use GSA) to that backlinks; 2) I have the same doubt about to build tiers pointing to some Ezine Articles and youtube videos, all with my money site backlink. Thanks for the help guys!