matrix_jan - 8:25 am on Jan 15, 2012 (gmt 0)
Never built any other links then in facebook page, twitter, and youtube. All were done on the websites' pages, didn't post any links to youtube video comments, didn't tweet to others with a link, didn't comment on other's posts in facebook promoting a url. All the links were just updates. Those make up about 1% of the nofollows, the rest is from user shares.
I actually built the website from scratch, and managed to optimize the structure. Still working on it and still see amazing details to which G pays huge attention.
If you do everything right, it won't matter if your content is duplicate on the web, or you have no links.