Badge Feed Guidelines NoFollow 
Adam Sherk
MAY 14, 2013
E-mail newsletters and RSS feeds. RSS feeds are another good opportunity, both for content discovery and because users sometimes utilize them to power link modules on a blog or other site, in which case they become a direct source of links. However the collective payoff can be substantial so it’s worth devoting some resources to it.
Techipedia: Tamar Weinberg
JANUARY 5, 2012
10 Ethical Ways to Buy Links : While some may argue that you need to nofollow links purchased via paid reviews (which is suggested here), link buying isn’t over and is a great way for many people to get the visibility they feel they deserve and the SEO value that may come from it. When do updates disappear from news feeds?
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