Amazon.com has been hiring new workers at an amazing clip, but a new study suggests that its employees are still feeling more overworked than their counterparts at other large technology companies.

Facebook, on the other hand, seems to have this whole work-life balance thing figured out.

A report out tonight from employment review site Glassdoor.com, based on online ratings from workers at various tech companies, puts the Seattle-based online retailer at the bottom of the pack of 20 large tech companies. Amazon’s work-life balance rating is 2.9, on a scale of 1-5, with 5 being best. That’s down from 3.1 last year.

Facebook remains at the top of the listed tech companies with a 4.3 rating — which is also enough to make the social networking giant No. 7 in Glassdoor’s broader ranking of work-life balance at all sorts of companies. Microsoft is in the middle of the pack with a 3.6 rating, down slightly. Salesforce.com improved the most, rising from 3.0 to 3.5 on the Glassdoor scale.

Here are the ratings for 20 top tech companies from Glassdoor, in alphabetical order.

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