I once had a college student apply for an internship in our finance department. The hiring manager came to me and noted that he had checked out her Twitter feed and she had horrible things to say about the university she was graduating from, as well as the professors she had. Every other word was derogatory. The hiring manager said, ‘If she talks about her school/teachers this way, what is she going to say about our company when something does not go her way?’