The micro-blogging site Twitter, which was the second best company last year, has fallen off the grid and is out from the list that ranks top 50 companies to work for in US and Britain, Glassdoor said in a statement.

Last year, it was the top rated technology company and the second best company overall.

"It is probably the single biggest change and surprise this year that Twitter did not make the list at all," Robert Hohman, co-founder and CEO of Glassdoor, was quoted as saying in a News report.

At No 2 is Bain Company, an American global management consulting firm headquartered in Boston, Massachusetts and at third spot is Nestle Purina PetCare, a St. Louis, Missouri-based subsidiary of Nestle that produces and markets pet food, treats and litter.

The social networking site Facebook has slipped to 13th position from the fifth last year while business-oriented social networking service LinkedIn has dropped from third position to 23rd spot.

Extra attention to make a balance between work and family responsibilities for its employees has nudged Google to No 1 this year, Glassdoor reported.

During the survey, Google employees cited increased paternity and adoptive parent leave to match that of mothers who give birth.

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