PR means PageRank. PR10 is the highest but very few sites achieve PR higher than 4. It is calculated by how many pages are link to your page. The more pages are link to yours the more important your content must be. Advertisers are more keen to work with you if your blog has high PR. If you want to know more about it, click here.
So, in case you're wondering what's your blog PR is, here's a free checker for you! I think it's fun to know. Mine is PR 2, woohoo! Happy blogging!
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