Boycott movements are often one of the most effective anticonsumption tactics used against companies that engage in practices deemed unethical or unjustified. This research explores the motives, causes, and targets of consumer boycott behavior using content analysis of Twitter feeds. Additionally, human sentiment analysis is used to investigate the relationship between boycott motives and the emotional intensity of boycott messages. The findings from analyzing a sample of 1,422 tweets show that while human rights issues constitute the leading cause of boycotts, business strategy decisions and corporate failures are also frequent causes, with for‐profit providers of products and services being the most common boycott targets. The results also indicate that although consumer boycott messages are more commonly motivated by instrumental motives, noninstrumental motives have higher emotional intensity. This study provides a deeper understanding of consumer boycott behavior, and offers implications for consumers and businesses.