Recruiting and HR blogs essentially perform two functions, Community Building and Branding. In community building, they essentially act as a central communications point which a recruiter might use to advertise, who/what they are looking for. The more information a recruiter shares about what is going on with an employer, the more likely a potential candidate may stumble upon it and or go to the Blog as a resource place. A secondary function of recruiting blogs is to put a personal face on what is frequently an impersonal function, governed by eCommunications and Voice Mail.
Blogs don’t get you a job and they don’t hire you. They tell you about jobs and employers.
Jobs work best when they target a narrow specific community. So for example, if I said I want to target Hispanic High Tech professionals who have a Bachelor’s degree or better, and must have worked at least 5 years in the high tech community, then I would be talking to many people who the Hispanic Net community wants to address. This could work.