How much do you spend on tier 2/3/4 links like web2.0, articles, profiles etc. ? How much do you spend on updating web 2.0 properties with content? I working with a site with about 15 pages that needs to rank, they have over 150 web 2.0s as tier 1 in total, updateing all of them with just one article each quickly ads up, the same when it comes to tiers building. Would you update all of them or just few for each page?