Yes. Maybe. We step on a lot of toes at times. Without giving enough details to derail this thread lets say the point of this blog is to open doors where powerful people have tried to hide various things that would threaten them.
Is there nothing that you collect, keep, and/or process that the user does not have access to. Can the user delete her own posts? Are you not a company making money?
If you answer yes to all of these, GDPR does not apply to your web board/blog.
Someone posting their real name or email address or street address or phone number isn’t you’re problem unless you are collecting that information and storing it in a way that is beyond the user’s control and access.