- The Birthday of the Local Boards I think are, in some instances, that of a prior Language Thread. For example, the Spanish Local board figures as the oldest, born on the 24/09/2010, but it was really constituted as a local board on the 19/05/2011 (see Please create a Local/Castellano (Spanish) forum). This is just a technicality that I found to be true for my local board, albeit an important one for the board itself.
I forgot to add some more notes, in particular the pre-history of the first post in your local board (Spanish).I left some notes previously but now it is time to edit OP with more notes to make it more understandable, and easily get more helps.
It is acceptable if I make mistakes in details or miss some local boards. You are definitely have more understandings on you local boards. If you find any of such mistakes or missed local boards, please help me. I appreciated all of your contributions to improve the thread.
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- Dealing with averages has its particularities. The longer the period of time, the more data points we flatten out into a single value, losing some perspective as to evolution of the values. Dealing with posts count numbers is a bit of a p.i.t.a., and at some point, I decided to follow these values for local board (not local threads) on a monthly basis
I know but for such a cross-sectional data (like the thread in initial version), the averages are all I can do for now. 
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Its interesting to play around with the data (alas, manually retrieved each month), and retrieve information in the process.
I agreed and I am going to observe and publish more data on monthly basis.Based on the published dates, this is the very first thread on that board [it doesn't represent its birthday]: 17/01/2011
Thanks. For the birthday of the Français local board, I am going to wait for @Halab.Quote
- Perhaps it's best to just add a note in front of those boards with no clear birthdays...
Added more notes.