This guy named Glen runs an incredible SEO blog, and he's got case studies of brand new sites/page [1]. He explains how single page sites and YouTube videos are beating out big established sites. His SEO work and breakdowns on his blog are outstanding, and there is great information on there. The marketing departments of every startup should be on this guys mailing list. I have 0 affiliation with him.
I've never seen anyone bring his name up on HN, and it's about time someone does. He has been saying all year: 2013 has been awful from Google's standpoint. People are gaming the system harder than ever, and maybe theres some smart people on HN who could use bits and pieces of what Glen does/preaches.
Since Google is always changing the algo, Startups tend to avoid considering using SEO as a way to get immediate results.. But there is still some time left in 2013, and instead of all the information marketing spammers benefitting, I believe it should be HN (legit businesses & startups)!