140 Proof was a startup company that developed a platform for delivering targeted advertising on Twitter. The company was founded in 2009 and was based in San Francisco, California. The platform used algorithms to analyze tweets and identify the interests of users, and then delivered targeted ads to them based on that information. 140 Proof raised venture capital from a number of investors, and was considered one of the early pioneers in the field of social media advertising. The company also provided analytics and measurement tools to help brands and agencies understand how their campaigns were performing.