URLhttp://www.glassdoor.com/
Year Launched: 2008
Reputation Impact Rating: Low
SEO Benefit: Yes
Advertising Options: Yes
Claim Listing: Yes

Glassdoor.com is a career site where employees can leave anonymous pro and con reviews about their place of employment. The idea is to give a searcher an idea of what it would be like to work at a particular company they might be interested in before they go through the entire application and hiring process. This allows searchers to find a company that fits their lifestyle best. The site also allows employers a chance to include a page with official corporate biographies and current job listings that searchers can find and apply for. 

As described on Wikipedia.
Glassdoor is an American “job and career site where employees anonymously dish on the pros and cons of their companies and bosses”.[1] In the year prior to April 2014, more than 500,000 company reviews were submitted to the site.

About Glassdoor (From Site Owner)
Glassdoor is the world’s most transparent career community that is changing the way people find jobs, and companies recruit top talent.

Glassdoor holds a growing database of 6 million company reviews, CEO approval ratings, salary reports, interview reviews and questions, office photos and more. Unlike other jobs sites, all of this information is entirely shared by those who know a company best — the employees. Add to that the latest jobs and the ability to see Inside Connections at companies via your Facebook network — no other community allows you to see which employers are hiring, what it’s really like to work there according to employees, and who you may know at a particular company all in one place. Glassdoor is also available via its mobile app on iOS and Android platforms.

For employers, Glassdoor offers effective recruiting and employer branding solutions via Glassdoor Talent Solutions. We help more than 1,500 employers promote their employer brand to candidates researching them and advertise their jobs to ideal candidates who may not be aware of them. What differentiates Glassdoor from other recruiting channels is the quality of job candidates we deliver and our influence on candidates’ decisions as they research jobs and companies.

From Alexa
Audience snapshot. Based on internet averages, Glassdoor.com is visited more frequently by females who have little to no college education and are searching from school (so students currently in high school or college).

 History as found on Wikipedia

Launched in 2008,[3]its ratings of CEOs and workplaces based on collating these reviews are widely reported, and in 2013 the site’s annual Employees’ Choice Awards were described as “well-respected” by the Daily Telegraph.

According to BusinessWeek,[5] Glassdoor “verified that the reviews came from real employees through technological checks of e-mail addresses and through screenings by a content management team”.[5] In 2013 Glassdoor said that “About 15 to 20 per cent of the content that is submitted to Glassdoor is actually rejected because it either doesn’t meet our community guidelines or it appears suspicious.

In 2010 Glassdoor launched “Enhanced Employer Profiles”, which allows employers to pay monthly fees to include “official corporate biographies, job listings and corporate Twitter feeds, alongside the untamed voices of their workers”.[7] In 2012 it raised $20 million of venture capital to support expansion outside the United States, taking its total outside funding to $42.2 million.

In April 2013, Glassdoor won an Red Herring North America Award for Social Media Innovation at the 17th Annual Webby Awards.