Twitter Inc (NYSE:TWTR) dropped from the list of the 50 best places to work in 2015 after being acknowledged as one of the best places to work in the United States in 2014 in a list compiled by Glassdoor. The list features the 50 best workplaces in the world, and last year, it was best tech firm and the second best company overall.

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Twitter made many top-level changes

Robert Hohman, co-founder and CEO of Glassdoor, said this is the biggest change and surprise this year, adding though that the company still ranks above the average. Management and leadership changes are a major reason behind the drop. In 2014, Twitter replaced executives who held key positions such as chief operating officer and chief financial officer.

Things were not smooth for Twitter this year, as employees went through a lot of internal reorganization, primarily in the product and engineering division. According to Hohman, the company had to let some tenured and talented people go after the IPO.

A company spokesman told CNBC that employees at Twitter are committed to a common mission and take pride in offering a platform to users that allows them to connect with everyone in the world. The executive also said Twitter is determined to grow into a global team and is open to taking in talented individuals to provide services across the planet.

Google topped the list

Google was the topmost company for the first time this year and found a place for the seventh straight time in the list of the top 50 companies to work with. However, its jump to the number one position was on the back of some improvements in its benefits. According to Hohman, Google employees appreciated their company for the benefits that allow them to balance their work and family life.

Glassdoor determines the rankings on the basis of feedback offered by employees who come forward to offer details via an anonymous online survey. Afterwards, Glassdoor uses a proprietary algorithm to decide the overall ranking based on the quantity, quality and consistency of the reviews.

The website includes responses from employees on various questions, including the best reason to work for a given company, the disadvantages and the level of satisfaction employees have with their company. Additionally, the survey asks employees to tell how they feel about the CEO of the company, career opportunities, compensation, benefits, culture, values, senior management, and work-life balance.