Every few months we update the PageRank data that we show in the toolbar, and every few months I see a few repeated questions, so let me take a pass at some of them. Note: I wrote this kinda quickly, so I think this is pretty good, but if I spot something incorrect later, I’ll change it.
Philipp Lenssen asks: “Matt, I often wonder, how is the PageRank value stored internally, is it a floating-point number as many people suggest or is it just the integer value itself due to the heavy recursive PR computations?”
It’s more accurate to think of it as a floating-point number. Certainly our internal PageRank computations have many more degrees of resolution than the 0-10 values shown in the toolbar.
viggen says: “Do i need to know that? What does it tell me when i know it? Why would i care? Meaning, what purpose has the Pagerank for the mom and pop site out there?”
viggen, I think that’s a perfectly healthy attitude. If you don’t care about PageRank and your site is doing well, that’s fine by me.
More info on PageRank