I don't really like subjective determinations like the one established by Justice Stewart. I believe that mk also used the phrase "thought-provoking" rather than "thoughtful." I'd argue that salacious content can easily apply to a strict definition of either "thought-provoking" or "thoughtful," but I'm not the one making that determination. I'm happy to see hubski emerge as a home for diverse, thoughtful discussion on the Internet. I think the true test of this platform is whether that discussion can coexist with a good dose of smut.
As long as the site is small enough that it can be easily monitored by a few of us, porn will be removed as soon as its noticed. That really isn't negotiable. If it grows to a place where its too big to monitor individual posts, then I suppose it will be up to the community to decide what is seen and what's ignored.