Hi there. I'm the author of the article. Since I don't exactly encourage to buy links, I didn't include a step-by-step guide to buying links on BuzzFeed.

This was purely research (with interesting results, if I may say so) and I don't want to lead anyone down a path that might hurt her in the future.

All the links sold on that marketplace are Do-Follow links. For all I know, Google does not care about No-Follow links.