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You can retrieve that information yourself (*1), although it may not be available at the regular intervals you want. For example, I keep track of the number of net(*2) created posts per month per Local Board/childboard (first level), and feed them to the Merit Dashboard (Post Count Evolution tab).(*1) Official forum stats run up to December 2017 (partial month). From there on it's a manual retrival process.
(*2) Net posts created: Created posts – moved posts (threads) – deleted posts
In order to do so, I used the available information on Archive webpages (WayBackMachine, ArchieveToday) to begin with, and then make sure I add the page I need to the archieve on the date I require to capture a snapshot. From there on, it’s a manual process of retrieving the information from the achieved pages, moving it to excel, performing 2 month diffs, and getting the info over to wherever you intend to exploit it.
- Registered accounts do not necessarily need the use of achieved pages (but it can be used). Playing around with Bitcointalk profiles and performing a manual dichotomous search (or alike) to reach an ID number on a given date.
- Number of posts and threads would require archived data as indicated above.
