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EMPLOYEE0Hi Stephan, the popularity score is created up of a few different factors that we have to take into account.
A large percentage is the Alexa rank, which in this case is the #1 most popular website in the world.
Although even if a website is the 1 millionth popular in the world, it might actually be the worlds #1 best website for pet shops, so the rank isn't everything. Another percentage is given to the growth over the last 3 months, this is to reward websites that might be the 1millionth in the world, but have actually made a huge increase recently from only being the 7 billionth.
Nibbler says "This website recently saw a slight increase in popularity" but actually it hasn't made as much growth as usual, so it's not getting the full marks for this category.
The Alexa rank only gives us a popularity rank for the TLD (google.com), unfortunately it's not possible to distinguish popularity for each of its subdomains (for example mail.google.com or docs.google.com). Nibbler tells us that www.google.com accounts of 69.9% of this traffic, so it could be that it's lost some of this percentage to some of the subdomains recently.
Hi Stephan I hope you agree that this actually makes sense and can understand why we do it this way, so we're not scoring websites purely based on their position, there's more involved and we think this makes it fairer for other websites.
Thanks for the question!