Selling a book or hawking a writing-related service? This is your place.
No corporate advertising.
No spam --- e.g., you should be offering books, ebooks, editing services, etc. Products unrelated to writing or the literary pursuits will be removed, and the poster will have access permanently revoked. "Spam" includes Web-related services like website management, SEO and social-media management.
Keep it simple and sweet. Link outbound as needed.