We calculate monthly actives as those who returned this month who didn't sign up this month. We are also now tracking cohorts of users who joined in certain wee

We calculate monthly actives as those who returned this month who didn't sign up this month. We are also now tracking cohorts of users who joined in certain week to see how many of them come back week 1, 2, 3, etc. That will let us see if engagement features we've implemented are working.