Twitter is blocking intelligence agencies access from using a Tweet-mining service for surveillance. Following Apple's high-profile stand-off with the FBI over the iPhone belonging to one of the San Bernardino shooters, Microsoft last month filed a lawsuit for the right to tell customers when law enforcement officials request their emails and other data. Twitter said it has had a "longstanding" policy of preventing a company called Dataminr from selling breaking news alerts to intelligence agencies that want to monitor Tweets.
