Facebook's biggest critic on Wall Street explains why he's convinced the company is going to keep si

Brian Wieser, an analyst at Pivotal Research Group, is one of Facebook's most vocal Wall Street critics. Wieser has been arguing for years that the company's stock is overvalued, and recent scandals and crises have borne out his predictions. The Portland, Oregon-based analyst argues that Facebook has "systemic" issues and there's not enough room left to grow. Business Insider spoke with him about Facebook's recent woes and what he thinks is next for the California tech giant. In July...