Hey @tranthidung, I have one suggestion: maybe it wouldn't be bad to update status of local boards, in regards to their current activity. I remember that you consider something like that as well
Over time, each month passes, I will have more data and I will consider to add more indicators, such as total posts and average daily posts within last 120-days period.
Imho, in current state it is kinda misleading, and doesn't give clear picture of local boards status . If you take that 120 day period, you will see that situation changed quite a bit. Several once very active boards are pretty much dead now, some that are marked as less active are more active now , etc.
Regarding the languages without local boards, I don't see the most active one,
Pakistan listed there. In the last 4-5 months they are the most active among those without local boards by far (not that there is much activity there, beside them and eventually Bangladesh and Serbian) , and probably more active than quite a few local boards. In last 120 days they might even qualify for your "less active" status , since they probably have more than 5 posts per day.