Create a compelling employer brand by designing a company career website for job seekers outlining the organization's values, culture, accomplishments and benefits. (entrepreneur.com)
This is a comprehensive list of career websites ranked by different metrics including but not limited to traffic and social activity. (careerigniter.com)
You can usually find out what these are by looking on the job description (if there is one) and the employer's graduate careers website. (targetjobs.co.uk)