Hi guys, So for a long time now I've been using web 2.0s linking to my money site. However I haven't implemented a tier system with any of them which I've been advised to do. 20 of these are tumblr blogs, 2 of them are wordpress.com blogs and 5 of them are weebly blogs. 4 of these tumblr blogs, the 2 wp.com blogs and 2 of the weebly blogs are ranking for my keyword on the 2nd and 3rd page of google. How would you best utilise these blogs in a tier system?