LinkedIn is a business-oriented social networking service mainly used for professional networking. It was founded in 2002 and launched in 2003. As of 2015, LinkedIn had over 400 million users in more than 200 countries. The site allows users to create profiles, connect with colleagues and professionals, and find career opportunities. Both recruiters and job seekers use LinkedIn to search for potential candidates and open positions. While requiring time and effort to build an effective profile, LinkedIn provides advantages like being easily discoverable by recruiters, allowing users to directly network with potential employers, and presenting profiles in a standard format.