I was looking at my public profile and I noticed a "popualrity" category. I'm ranked in the upper 3000's out of 50,000. My friend, who is like one level below me, is in the 48,000's. And then, to top it off, I saw a guy who is in level 2 and he's in the 1,800's. So, my question is what is popularity based off of? Reviews? Number of times someone looks at your profile?