Started on October 15th 2007, the Agile and Lean Software Development Group on LinkedIn has now over 30,000 members. Looking at its growth over the years:
On an average, 350 new members are joining the group every week (a 7% growth.)
On an average, 13 discussions every week, but close to 300 comments each week is awesome. Shows that the group is very active. We also get a ton of promotions and jobs.
London, UK and San Francisco Bay Area seems to contributed highest number of members. Also pleasantly surprised to see Bangalore 5th on the list.
You can view all these detailed stats yourself at the group dashboard.