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After being rated one of the best places to work in the U.S. in 2014,Twitter's perception has taken a major hit.

The social media company has completely fallen off Glassdoor's annual Best Places to Work list, which ranks the Top 50 companies to work for in the U.S. Last year it was the top rated tech company, and the second best company overall.

"It's probably the single biggest change and surprise this year that Twitter didn't make the list at all," said Robert Hohman, co-founder and CEO of Glassdoor.

Hohman said that the company still ranks above average as a place to work, but it took a hit because of a number of management changes in leadership during the last year.

Numerous positions, including its chief operating officer, chief financial officer and key executives in media and engineering, have all seen turnover in 2014.

"Twitter has had a particularly challenging year. Employees talk about their being a lot of internal reorganization, especially amongst the product and engineering teams. They have lost some talented and tenured people post-IPO," Hohman said.

Asked to comment on this change, a Twitter spokesperson told CNBC that "Twitter employees share a mission and great pride in building a platform that enables our users to connect everyone to their world. We're continuing to grow our global team and are always looking for talented individuals to help us reach every person on the planet."

While Twitter didn't make the cut, Google took the top spot for the first time. The search giant has placed in the Top 50 for the seven years Glassdoor has released the report, but the tech company was pushed to No. 1 this year because of some improvements in its benefits.

Hohman said that Google employees praised the company for benefits relating to balancing their work and family life.

Other tech companies that made the list include Facebook at No. 13,LinkedIn at No. 23 and Apple at No. 22. The full study from Glassdoor can be read here.