[gnaritas]

Google relies on an ever changing definition of what they consider "good content", which may currently include dofollow back-links and may not in the future. Optimize for good content and you don't have to worry about such ever changing implementation details. Trying to figure out how Google currently works is a losing arms race, understanding what Google is trying to do, find good content, and providing it, is a winning strategy.

All those stories about people losing their businesses because Google changed their algorithm, those were people trying to game Google to promote their content higher than it should have been, Google will always win that contest.