How do we calculate the number of Google+ accounts?
Before November 15, 2012, we use the numbers Google provided publicly. Since then, we began calculating the number on our own. To do this, we first download the Google+ Sitemap. Then, we walk through this file and find all the sub-sitemaps available. For each sub-sitemap we find, we download it and then count the number of Google+ profiles and the number of Google profiles contained within it. Tallying all this data gives us two things: the total number of Google+ accounts and the total number of regular Google accounts. We do this once a day.
However, the Google+ sitemap has been known to go down (404) periodically. It was missing completely for two+ months from mid April 2013 until July 2013. As such, you may see a sparsity of data points during such time frames.Google+ Sitemap URL >> http://www.gstatic.com/s2/sitemaps/profiles-sitemap.xmlHow do you count the size of the index?
This is a much simpler process. We simply perform a specific
Google search across Google+
and a slightly different Google search across Google+
. We then take the largest number of results returned from these two searches giving us our Google+ index size.Do you want to take a look at the source code?
Hangout with +Greg Miernicki
and it will be provided.