PR - Page Rank Google propaganda for supposedly what they want in a website. Unimportant in today’s SEO world.

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Nofollow is a bit of code that you add to a link that signals to Google that the link going from this page to another site that is supposed to tell search engines not to follow that link. Search engines do still follow the link, but Google won’t give that link the same kind of value as when this kind of link isn’t involved (aka DoFollow links). There are many web 2.0 sites that give nofollow links sitewide, like YouTube. That doesn’t mean that the link isn’t still valuable - it is! But it’s not as valuable as it would be otherwise.

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Web 2.0 Properties Any site where content is built primarily through encouraging users to have their own pages. Early examples included MySpace and YouTube. Now some of the biggest Web 2.0s include Facebook and Twitter. Web 2.0s are extremely easy to rank right now. Unlike regular websites we can fire thousands and thousands of lower quality links to Web 2.0 properties to boost their ranking with much less fear of getting penalized by Google.

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Expired Domains A website that was, at one point registered, and is no longer registered. Sometime these domins can have good SEO potential because they already have links coming to them. They can typically be registered for the same price as a new domain from services like namecheap.com

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