I made my first #photosphere on 1 Dec 2013 - my total now is 45. What started as a Can I do it with a DSLR? has ended up as a theory into discovery.
In other words, the latest image (of the library) shows a higher view rate than the rest.
This was the first internal panorama of a public library in Essex, UK. It was tweeted by +Essex Libraries.
It's best to view the data sheet and charts in a new window. Photospheres are can be viewed in four places:
1, Google Maps 2, Google Maps Views 3, Google+ Photos and 4, Embedded in a webpage. You can see the difference with these links for the library..
To get started yourself, visit the Google Support Page. Anyone can do this. And also make sure you check regular updates from Google's +Evan Rapoport too.
I would be interested in hearing from anyone doing a similar study. I'm a teacher, so I'm not in a race for views, but rather the place a #photosphere sits in the suite of Google Services. For example, we have Panoramio that's also available and now shows g+ photo features (Remember Panoramio has been showing photos at Google Earth for years).