I don't see anything wrong with posting in on Craig List.
People should understand the Job Recruiting market. There are lot of ways for Organizations (private or public) to send their recruitment /job descriptions for a job position, including but not limited to: Organization official sites, Craiglist, Fabook, LinkeIn, Twitter, Monsters, Google, Staffing LLCs companies, etc. Once the job seeker applies, then the company HR department would be the one contacting them. The point is companies are looking for the best possible candidates.