What's the big deal? "US National Security Agency 'spied on French diplomats". That is what spying agencies do, and they seek information that is valuable to their interests. And that includes France.

The U.S. gets spied upon too, and does not make a big deal out it. You can catch criminals through the internet, the same way the French do also.

The truth is most developed countries have the technology to embark upon an intelligence gathering program. This allows the country to adopt new technology and develop its own. Technology is one of the main issues that countries look after, the way they save on to keep abreast of their competitors.