Matt Cutts was recently asked, “Why don’t you switch off the PR Toolbar feature? It is widely used by link sellers as a link grading system. Why do you continue to display PR publicly? It appears to have little relevance, except to spammers. ” submitted from “Danielroofer, Camberley, Surrey, UK”
Not sure why they chose this question out of all the questions being fired at them to respond to, but it doesn’t really seem like that big of a deal. It’s not like spammers won’t use the 100 other metrics out there to score a site such as “PA, DA, AHREF score, SERPIQ score, etc.” See the video for official response.
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Part 1 - An SEO's Guide to Tumblr
Part 3 - The value of Tumblr links revisited