Can a blog be useful for SEO purposes?
It can, but blogs are a different animal than static websites, and must be treated as such. A blog is very useful because it provides a website with plenty of related fresh content. Considering many websites don’t have content that changes very often, a blog can be a way of commenting on related news and getting more search engine traffic.
Running a blog is hard work
But one thing about blogs is they take a lot of work to maintain. To establish any sort of quality on your blog requires making well written and cohesive posts on popular topics. If you have the time to update 3-5 times a week, than adding a blog to a website can be a fantastic way to build timely long-tail traffic.
If you enjoy writing, then a blog is something you can easily maintain. You might even have fun updating. When you blog, you “ping” the major blog search services, and they tend to take your content right away. Generally the main search engine indexes will also pull your content in almost immediately. Blogging is a way of telling Google that your website updates a lot, and is “in the know” on your subject.
If you have the time and the inclination, adding a blog to a website that doesn’t update much is a great idea. It will help you stay in touch with customers. It can help improve your website’s credibility. Updating often will give search engines the evidence they need to keep on visiting your website and sending in new prospects.