I love free advertising and have never paid for advertising in the eight years that I've worked online. I like to post on Google + as a way to advertise my blog(s) but it also helps me hone my writing skills. In addition, I write articles for free distribution and the backlink included in the signature line helps advertise my blogs. Also, I use forum signature links when appropriate (assuming it's the same niche as my blog) to discreetly advertise my site(s). Sometimes, I find free directories that let me list my blogs. Guest posting on other blogs (with a signature line) is also a great free way to advertise a blog. All these free methods help my SEO efforts and actually get real traffic. There are many other free ways to advertise and promote a blog or site. Please share your free promotion technique.