There's no denying that a % of NAS is a sewer, but I've yet to find any social media community that didn't have that issue.
Social media is toxic in general, and appeals to our more base instincts. So I think NA needs to decided if they want to be associated with this style of "micro-blogging" social media platform in general, or not. If so, I don't know how you avoid the bad apples. It's part of the package.