Overall great idea, though I would mostly use it for the project management/collaboration part than the AI part. The majority of the AI generated posts were a bit too "fluffy" and stereotypical for me. However, a couple of suggested posts could serve as an inspiration to be rewritten by a human.
I would definitely offer a free tier though, even if it means severely limiting the capacity of a user. I almost never try a tool which doesn't have a free tier :) Great work team, hope you make it to #1