Well, for what it's worth, here's the latest chart:
Basically, we've picked up at almost the exact same pace we were at last year. However, we had a huge offseason, so we're currently up nearly 200k posts from this point last year.
We're also WAY up in the number of actual users logging in on an average day. This year, we averaged 943 users per day in September compared to only 767 last year.
It'll be interesting to see how the team's performance impacts Planet activity from here on out.