We hear from focus group companies that these postings are pretty effective. I'm a dealer or broker, like for cars or real estate. Mostly, just respect the community, don't overload a category, and let people know that you're a dealer or broker. No resume fishing, no bait and switch, and no other dishonest or misleading tactics. That's not something we allow, since we feel that's contrary to our idea of community spirit, based on a lot of feedback.
People are antsy about any kind of for-profit postings.
Postings that offer payment for employment are considered to be a job posting. We don't allow company-specific job fair or open house postings. We do, however, allow the posting of a general job fair so long as the job fair or open house includes many companies. We're still trying to figure out the best policy with this. That's fine with us as long as the link does not lead to a list of all jobs available in your organization.