The title might not correctly explain it. Many of my Tier1 s are on subdomains of Web2.0s. For example: http://exampletier.wallinside.com and some are subdirectories like this: http://www.blackplanet.com/exampletier Normally I have been hitting my tier2 and tier3 web2.0s with the kitchen sink(all engines) under the belief that they are large sites and they can handle the spam and the tiers won't be penalized or deindexed. Is this wrong? Does Google consider the subdomains to be a different website when it comes to links? Should I stop throwing the kitchen sink at them and be more selective?