Search engines provide hundreds of free candidates, and companies such as Brownbag Recruiter and JobMachine now have classes to teach recruiters how to use search engines to source candidates. 搜索引擎提供了上百个免费的候选人,并且一些职业介绍公司设有专门的课程教招聘人员如何有效的利用搜索引擎找到合适的候选者。