There have been raging debates about whether Edward Snowden is a whistleblower, hero, criminal or traitor after the former CIA employee revealed the US National Security Agency's top-secret surveillance program of people's phone, e-mail and Internet records.

But people both inside and outside the United States owe the 29-year-old a thank you for telling them that they are being closely watched by a government that likes to portray itself as a protector of privacy and civil liberties, and a role model for other countries.

Most people, except those at the NSA and a few lawmakers like Dianne Feinstein, chair of the US National Intelligence Committee, were not aware of the surveillance until Snowden exposed it.