1999 – Build it and they will come. (a.k.a. field of dreams syndrome)

2004 – Build it for users, not search engines, and they will come.

2009 – Build it for users, optimize it for search engines, create content for link bait, promote it through social media, reoptimize it for conversions and they will come and convert.

The advice hasn’t changed. There are just a few more pieces.

via SEOmoz