I am currently running one Apocalypse World game on Discord, with mixed but for the most part positive results. In general, I encourage people to post whenever possible, with a few gentle reminders if they seem to have missed my last MC post. I'm in another four PbP games, and have a fair amount of experience with the pros and cons of the style from both sides of the screen, so to speak. The posting rate varies from multiplie back and forth interactions, to a once per day/couple days larger posts. I've found Discord works quite well for online games, as multiple channels can be used simultaneously for specific purposes. If you're interested, I'll send you an invite.