I just started using Glassdoor, mostly to vet companies and see obvious problem areas, and I don't know how I worked without it before.
Absolutely. It's also a great source for questions to ask during interviews. Sometimes Glassdoor reviews will expose something notably good or bad about an employer. Asking about it either gives them the opportunity to brag about their strong points or to allay concerns about any problems.
One company's reviews talked a lot about acquisitions and reorganizations, so I asked about that.
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