Selected answers from the Dumb SEO Questions G+ community.
David Harry: Not sure why you`d NF the "related posts" links... So, yea... I`d change it
Michael Martinez: Yes, definitely remove the "nofollow" attribute. There is absolutely no reason to nofollow internal links to content on your site. If you don`t trust your own content there is something wrong. It`s okay to use "nofollow" on links pointing to login pages, shopping carts, and other "user private" pages that you don`t want to be found in search.
David Ogletree: Related posts can help a lot but they have to done corectly. Don`t have too many and they should be truly related.
George G.: do not nofollow your internal links. this gives the engine signals that you dont trust your own content.
i ve seen some themes (like newspaper) that do that by default and I ve seen quite a few guys complaining they dont rank using those themes... cos your onsite doesn not pass any juice or authority.
tldr - always dofollow internal links.
Tony McCreath: What about faceted navigation links. I try and nofollow them to save Googlebot some time. Same would go for infinite paths like calendar links.
Neil Cheesman: Look at Wikipedia - internal links/related posts on just about every page - followed...