0.09 posts per day. Impact of a hummingbird feather, I’d guess.
2.48 posts per day, over 6,000 total. I guess I’m prolific. Some days I post dozens, other times I go a days, even weeks away from the board.
Do I have an impact? I dunno - I seem to be remembered for airplanes and virulent skin infections 
Not the combo I would have chosen, but apparently that’s the way of things.
Yeah, but that says nothing of my impact. I’ve no idea if what I type here makes for an actual change in the real world. A few posters have said it did in their cases, but we really don’t know how that compares to the impact of anyone else.
IMHO, it’s hard to measure the impact of any particular poster over time.