is a system where existing employees recommend prospective candidates for the job offered, and usually, if the suggested candidate is hired, the employee receives a cash bonus. Niche firms tend to focus on building ongoing relationships with their candidates, as the same candidates may be placed many times throughout their careers. Online resources have developed to help find niche recruiters. Niche firms also develop knowledge on specific employment trends within their industry of focus (e.g., the energy industry) and are able to identify demographic shifts such as aging and its impact on the industry. Social recruiting is the use of social media for recruiting. As more and more people are using the internet, social networking sites, or SNS, have become an increasingly popular tool used by companies to recruit and attract applicants. A study conducted by researchers found that 73.5% of Cypriot companies had an account on a SNS, the most common being Facebook, LinkedIn, and Twitter. There are many benefits associated with using SNS in recruitment, such as reducing the time required to hire someone, reduced costs, attracting more “computer literate, educated young individuals”, and positively impacting the company’s brand image. However, some disadvantages include increased costs for training HR specialists and installing related software for social recruiting. There are also legal issues associated with this practice, such as the privacy of applicants, discrimination based on information from SNS, and inaccurate or outdated information on applicant SNS. Mobile recruiting is a recruitment strategy that uses mobile technology to attract, engage, and convert candidates. Some recruiters work by accepting payments from job seekers, and in return help them to find a job. This is illegal in some countries, such as in the United Kingdom, in which recruiters must not charge candidates for their services (although websites such as LinkedIn may charge for ancillary job-search-related services). Such recruiters often refer to themselves as "personal marketers" and "job application services" rather than as recruiters. Using multiple-criteria decision analysis tools such as analytic hierarchy process (AHP) and combining it with conventional recruitment methods provides an added advantage by helping the recruiters to make decisions when there are several diverse criteria to be considered or when the applicants lack past experience; for instance, recruitment of fresh university graduates. Employers may re-recruit prior rejected candidates or recruit from retired employees as a way to increase the chances for attractive qualified applicants. Multi-tier recruitment model In