Cambridge Analytica, a political consulting firm linked to Donald Trump's 2016 campaign, was accused of improperly acquiring data from 50 million Facebook users to influence voters. The scandal revealed significant shortcomings in Facebook's data handling and raised questions about the firm's tactics, including attempts to manipulate public opinion through psychographic profiling. Ultimately, Cambridge Analytica ceased operations in 2018 amid increasing scrutiny and allegations of unethical practices.