@alternative_be
You can renormalize by the probability of each group being online for the period of 1week. That way you can have an estimation of everybody even the ones not locked-in.
For example for the one week period group you will have these people having a 50% chance (I think, I have to actually do the math to be sure) to seen your post therefore you devide their number by 50% which is the same with multiplying by 2.
@greatlevi