I left Posterous over a year before the acquisition due to a difference in opinion over strategy. Brett had also left before. I didn't agree with where my cofounder wanted to go with it. I was bummed to see it didn't work out as we had hoped when it was acq-hired. I use Posterous a ton, and I needed a replacement anyway. Thus, Posthaven. I've been working at YC since 2011, actually.