On May 3rd of 2012 the Google+ extension http://tinyurl.com/VisibleData of this Data Visualization blog reached 500+ followers, on July 9 it got 1000+ users, on October 11 it had already 2000+ users, 11/27/12 my G+ Data Visualization Page has 2190+ followers and still growing every day (updated as of 12/01/12: 2500+ followers.
One of reasons of course is just a popularity of Data Visualization related topics and other reason covered in interesting article here:
In any case, it helped me to create a reading list for myself and other people, base on feedback I got. According to CicleCount, as of 11/13/12 update, my Data Visualization Google+ Page ranked as #178 most popular page in USA. Thank you G+ !
Update 5/25/13: G+ extension of this blog now has 3873+ followers and as of 7/15/13 as of 4277+ followers):