The American Government isn't spying on the US (and UK) citizens, it's carrying out counter terrorism efforts by collecting and storing virtually every Internet phone call, email, text message, Internet search, social media communication and virtually all other electronic information. That's okay then.
Obama is arguing that the surveillance programs have helped in the fight against terrorism and pointed to a specific plot against New York's subways which ruffled a few feathers at Scotland Yard because they said that it was them who passed on the information to the American Authorities that prevented the subway attack and not Internet snooping.
Obviously there are some words and phrases that if typed into Google will bring you to the attention of the authorities such as Assassination, Dirty Bomb, Militia, Terrorism, Anthrax, Ammonium Nitrate or How To Assassinate a World Leader but there are a host of innocent words that could also see you bundled onto an aeroplane and whisked off to Cuba and a fetching orange jumpsuit.
Luckily the Department of Homeland Security has released a list of keywords and phrases it uses to monitor social networking sites and online media for signs of terrorist or other threats.
The more of the 'alert' words the shadowy types find in an email or electronic communication, the further up the list of potential evil-doers you rise but some of the words on the list are seemingly innocent but hide evil intentions, such as Drill, Authorities, Stuck, Recruitment, Aid, Watch, Blizzard, Salmonella, Cancelled, Agriculture, Exercise, Subway, Recovery, Southwest, Landing, Cloud, Pork, Wave, Electric and Worm and the mention of North Korea, Iraq, Afghanistan, El Paso, Iran, Pakistan, Yemen, Somalia, Nigeria, China, Colombia, Mexico and San Diego which much play havoc with the San Diego Cloud Authorities email system.
I don't understand why the number 2600 attracts unwanted attention but if you are STUCK in the SUBWAY with a bad case of SALMONELLA from a PORK chop whilst on the way to a RECRUITMENT Day in the SOUTHWEST during a BLIZZARD, you may want to rethink sending that text or email.