when we blast a tier 1 page like an article page with links from blog comments or trackbacks, we lose a bit of pagerank benefits because of twitter, facebook and google plus url links. I find it annoying. Dont forget twitter homepage = 10, facebook homepage pagerank = 9 , google plus homepage = 9 However none of those homepages have content on it. It is outrageous. For instance, I have a tier 1 article with 1 URL to my moneysite on it. On the same page there are 3 outbound links to facebook, twitter and google plus and it is ********. It means that if i point links to this particular URL i get only 1 / (1+3) * 100 = 25% of the google juice. I think it is good to send emails to webmasters and tell them: "please put a nofollow on facebook, twitter and google plus links". Anyways facebook and twitter links are nofollow. So, for the webmaster there is no benefit.