Mired in several controversies amid break-up calls from the US lawmakers, Facebook has once again slipped off Glassdoor's "Best Places to Work" list for the second year in a row.

Facebook dropped to 23rd best place to work, falling 16 spots from last year's position, and its award score fell from a 4.5 to 4.4 out of a perfect 5, according to the annual listing by the leading job website.