I've been thinking about this for quite some time, but my recent experiences with building tiers in linkbuilding have been increasingly negative. So after a couple months of experimenting I've come to wonder if one of two things is true... Either A) multi-tier linkbuilding (such as MS < T1 < T2 < T3) is dying out as cheap feeder links become useless. or B) Tiered linkbuilding needs to be done in a different and new way. If it's just dead then having any discussion is pointless, so I'll look into what might be wrong with the way linkbuilding is being done. My primary concern in this, cheap spammy links are toxic... yet every tier needs links and the T2/T3/T4 etc can't afford to have high quality links like true PNB's. So if you're going to build more tiers you are forced to use cheaper and cheaper links as you go. This eventually builds up link toxicity, and pretty soon you've ruined your T1 link and your efforts are all ruined. I've tried a wide range of "cheap" links, links that can be produced or bought for a few dollars, and none were any good on even T3/4. I've experimented with social signals as well... they are great for supporting HQ links, for adding them to cheap crappy T3 links is not very helpful as the links are too spammy to pick up any PR. So here is the big question... if that were the case then what would the solution be? Is the answer that building multi-tier structures is going to become a VERY expensive endeavor that will cost $100's for each tier's backlinks because we're forced to use such high quality on everything? Is it possible that the rules of the game really HAVE changed and tiers aren't useful?