It depends on the forum. I used to chat on a fully public forum with a few friends (whom I never met outside the forum) back in the 2000s. A couple hundred post

It depends on the forum. I used to chat on a fully public forum with a few friends (whom I never met outside the forum) back in the 2000s. A couple hundred posts a night was typical, each post on par with or even shorter than a typical tweet. We never moved to an IM for some reason.