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Martin Sleziak
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To complement the answers already posted, here are some SEDE queries. (SEDE queries have the advantage that they can be run by any user - and they also can be easily run on other sites. And also if we run those queries at some future date, we get an updated information. On the other hand, site analytics contain also some information which isn't available SEDE - for example page views or visits.)

I should include the usual caveat that SEDE is only updated once a week. You can also notice that it is possible to change the parameters with start and end date in the queries below. (I have chosen the startpoint in November - so that it is easier to compare the graphs with the ones that have already been posted.)

Here are some examples of queries which could (very roughly) correspond to some measure of activity on a Stack Exchange site.

Number of posts

Specifically, if we look at the first query - with the number of posts - we get the following graph. (It would probably be good to update the picture a few weeks later - to see how the trends change after that.)

Screenshot of a graph

We can also run a similar query counting posts in the whole network. This is what it looks like at the moment:

Screenshot of a graph

We can also check how the similar stats evolves on some other sites - for example, StackOverflow Mathematics, Physics, Computer Science or Academia. (Of course, if a site has generally low activity, random fluctuations can be significant enough to overshadow some general trends. For example, you can try Math Educators or this meta.) Of course, there are sites where you'd expect increase of posts, such as Politics or Skeptics, perhaps even sites such as Law or History.

Martin Sleziak
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