Respond with personalised comments rather than a generic Thank You. Fostering a conversation helps build the credibility of your blog!
E-commerce bloggers can gradually choose to write curated content from other websites/blogs. That always helps because a buyer will generally not spend much time surfing. He/she will appreciate it if you provide most of what they are looking for.
Respond when someone likes or comments on your post. Visit their blog and send your comment love. Courtesy brings in more readers and friends.