Selected answers from the Dumb SEO Questions Facebook & G+ community.
Jim Munro: You should avoid creating a pattern that might be considered unnatural.
Richard Hearne: That list is most likely empty. But if I was starting, the first place I`d look is my immediate network - suppliers, partners, customers. Links from them are likely going to have value.
Glenn Cooper: Check competition links, they`re usually quite easy to replicate
Michael Martinez: You want to earn a unique link profile, one your competitors cannot easily replicate.By the same token, getting links from all the same places your competitors gets them puts your site at risk of incurring whatever penalties they have earned, and you at risk of wasting your time on whatever worthless links they have gotten.The easier it is to get a link the less likely the link will help and the more likely it will hurt a site.