Please rate the best link building strategies

Here are five rather easy back link strategies. Assumed you have the time or resources to get quality articles written, hub pages content produced, forum profile signatures created and manual directory submissions.

How would you sort following back link techniques by SEO benefits! I know diversification would be best, but I would like to know your preferences.

Paid Links
Forum Signature
Article Directory
Web Directory Submission
Hub Pages creation (Squidoo or Hubpages)

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For me the best technique is killer content with social media. For instance you create a great resource article or a tool for your niche and then you submit it to social media sites (that could be anything from twitter to digg)

If your content is cool enough to go viral you will get several links from blogs besides the traffic from the buzz. It is not the easiest way for link building but I am sure it is the best way to kickstart a site.

For me the best technique is killer content with social media. For instance you create a great resource article or a tool for your niche and then you submit it to social media sites (that could be anything from twitter to digg)

If your content is cool enough to go viral you will get several links from blogs besides the traffic from the buzz. It is not the easiest way for link building but I am sure it is the best way to kickstart a site.

Nikolas, while I agree this is a great strategy, not all of us are in industries where this will work. I like it. Just doesn't help me.

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I believe that content & social media is suitable for any industry. Can you give an example of an industry that you can't use this strategy?

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