1. Be specific.
2. Don’t leave a link.
3. Stay on topic.
4. Be nice.
5. Keep it brief.
Practice respectful disagreement, not personal attacks.
Be brief and don’t turn every comment into your own personal blog post.
Be brief and don’t turn every comment into your own personal blog post.
And, on being a "blog hog":
You might be a blog hog if you hijack someone else’s blog and use your comment to toot your own horn, discuss your accomplishments ad infinitum without being asked, hog the thread, dominate the conversation vs. join it, or take it upon yourself to jump in and reply to every question or comment other visitors make.