So its been a long time since I've done any real seo like 4 years or something. I have a question about web 2.0s. When I say web 2.0s I'm thinking of things like mywebsite.blogger.com or mywebsite.wordpress.com. Why do these web 2.0s help websites rank? I know the obvious...more links = more juice. But I've always read google treats a new sub-domain as a new website completely separate from the root domain. So mywebsite.wordpress.com would have zero juice to pass to mymoneywebsite.com? How do they help?