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Google used to update PR of every website at least once every three months, but not anymore. On Oct 6, 2013, Matt Cutts tweeted he would be surprised is there is another PR update before 2014. He basically implied there will be a very slight chance there will be another PR update in 2014.
Now it is 2015 already, there is still no update on PR, which might means Google has weighted less on PR number. Of course, there is a rumor that is flying around saying PR is updating everyday, it is just not showing anymore.
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