Blog commenting, in the context of SEO and digital marketing, refers to the practice of leaving comments on blog posts with a link back to your own website or blog. Here are some key points to consider about blog commenting:

1. **Purpose**: Blog commenting can serve several purposes, including building relationships with other bloggers, engaging with their content, and potentially driving traffic back to your own site.

2. **SEO Impact**: In the past, blog commenting was sometimes used as a strategy to build backlinks for SEO purposes. However, its effectiveness for SEO has diminished over time due to search engine algorithm updates that now prioritize quality and relevance over quantity of links.

3. **Quality vs Quantity**: Rather than focusing on leaving comments solely for the purpose of getting a link, it's more beneficial to focus on leaving thoughtful, relevant comments that contribute to the discussion or add value to the blog post.

4. **Engagement**: Engaging in blog commenting can help you establish yourself as an authority in your niche, connect with other bloggers and their audiences, and potentially drive referral traffic if your comments are insightful and relevant.

5. **Best Practices**: When engaging in blog commenting:

   - Read the blog post thoroughly before commenting.

   - Provide genuine feedback or contribute to the discussion.

   - Avoid leaving generic or spammy comments.

   - Use your real name or a consistent username.

   - If allowed, include a link to your website only if it's relevant to the discussion and adds value.

6. **Ethical Considerations**: Avoid spamming blogs with irrelevant or self-promotional comments just for the sake of getting a link. Genuine engagement and adding value should be the primary focus.

In summary, while blog commenting can still be a part of your digital marketing strategy for building relationships and engaging with the community, its SEO impact is limited compared to more substantial and sustainable SEO tactics such as creating high-quality content, earning natural backlinks, and optimizing your website's technical and on-page elements.