Promoting a blog or website is a continuous process, provided that is you actually want people to visit your site. For most individuals/businesses/charities/artists/writers we want people to visit our site, that was the whole point of setting up a website in the first place.
There are many facets and opportunities in promoting, forum SEO just one of many.
Forum SEO has garnered a recently “retired” WordPress.com support volunteer over 8 MILLION hits on their relatively mediocre site. So, it’s a strategy that IS very VERY powerful.