The news that Google is going to treat sub domains and sub directories much like the treat folders- Sub Domains To Be Treated as Folders By Google has implications for online reputation management.

Once this is rolled out, it will limit you to two results per domain for each search result, which means that you can no longer dominate the SERPS with subdomain1.site.com, subdomain2.site.com, etc., as they will now be treated like subdirectories: site.com/subdomain1, site.com/subdomain2, etc. This means that you should not view using sub domains as a reputation tactic and could lead to you losing control of more space in the top search results.

More on the subdomain subdirectories topic from Matt Cutts of Google.

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