There has been a lot of debate as to whether outbound links to authority sites have a positive effect, a negative effect, or no effect at all. There has been a lot of people arguing both sides, and both presenting evidence to support their claims. Linking out has no effect: Just recently at Sydney SMX a Google employee directly stated that there is no direct value to linking out Ahrefs has found almost zero correlation between percent of pages with links to DR 70+ websites and rankings Linking out has an effect: A case study built ten websites going after a dummy keyword with everything the same besides whether they linked out found that the sites containing outbound links all consistently outranked the sites without outbound links. All three points have flaws. Google spreads FUD all the time, and their claim that it doesn't "directly affect rankings" leaves open the door that it indirectly affects it in some way in their algorithm. The Ahrefs data is certainly very useful, but correlation does not imply cause and effect. The case study seems the most interesting to me, but the sample size is incredibly small, and since they are all websites with no links, it may be that the benefits of outbound authority links are so insignificant that they would only become apparent when doing SEO for a dummy keyword with absolutely zero competition. What does everyone here think of all of these data points and is there any additional research or any additional case study that could be done to give us a more definitive idea as to whether outbound authority links are worth paying any attention to?