Ya you are right..Generally while submitting our website url to a particular site helps in increasing our PageRank..When submitting to sites with PageRank 0 is useless since our PageRank might become low..
There is little bit confusion about 0 PR ,do follow and no follow , if blog is no follow then 0 PR is also consider as good thing and in case of do follow its has no worth .
I don’t really think that PR 0 is useless I think there are many web sites that having good traffic from online and don’t care about page rank. Only site traffic matter in online marketing there is huge sites those have PR 4 to 6 but not really good traffic. So it’s an old metric which is not effective in ranking and traffic too Reputation Management
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