One might well question whether there is "The Dunbar Number", but here is a set of numbers from SWC.

Members who have posted at least once after 31 Dec 2009 and have posted in total:

50 or more - 145

250 or more - 65

500 or more - 42

1000 or more - 31

From "company-sized" to "platoon-sized".

Regards

Mike