LinkedIn是全球最大的职业社交平台，于2003年成立，总部位于美国加利福尼亚州山景城。LinkedIn的使命是“连接全球职场人士，让他们更加成功”。作为专业的职业网络，LinkedIn通过帮助用户建立人脉、发现机会、学习技能和分享洞察，为全球超过9亿用户提供服务。

Totaljobs.com is one of the UK's jobs boards, attracting over 3.6 million jobseekers every month on the hunt for one of 90,000 live job ads the site carries at any one time. All of this activity generates over 1.9 million applications a month, cementing totaljobs.com strong reputation among jobseekers and recruiters alike. Thousands of

Glassdoor is a job and recruiting sites that operates online jobs and career community. It helps employees, job seekers, employers, and recruiters in finding and sharing information about the companies and jobs that include company reviews, interview questions and reviews, office photos, salary details, and information to make career decisions.Rich Barton, Robert Hohman, and Tim Besse founded June 2007, with its headquarters in Mill Valley in California. Glassdoor operates worldwide.