Man, seeing this chart reminded me why I wound up leaving for so long at the end of 2013: that big drop in activity from the end of 2012 to about mid-2013 really affected my enjoyment of this forum, eventually it just felt so boring here that I wound up not even bothering to visit.
Kind of sad to see a visual representation of a community's slow death like that, especially when its one of a dying breed like an owner-hosted php forum in an age where online communities are now primarily based on massive social media platforms like facebook and reddit which thrive off the exploitation of user data unbeknownst to (most of) the users themselves.