Snowden made this issue to public that NSA is collecting the personal calls and emails of US citizens . After it a flood of criticism hit the USA. Later on a special court gave verdict that the NSA programme is unconstitutional and it should not be allowed to spy on the public use of internet and to record Phone calls.
NSA floated their views that it all was being done for the safety of USA and the people of USA. But it was against the laws of privacy.Under the program targeting foreign Internet traffic, the NSA collected as many as 56,000 emails and other communications by Americans starting from 2008, but the efficiency which was required to filter this information was not properly achieved by NSA . So it proved useless.
NSA also claimed that through this programme it successfuly saved many of the terrorist activites in USA and abroad on the US citizen and diplomatic missions.
The NSA programme was not limited to USA but it was also intended to catch the information from outside countries like Iran and Pakistan.
1. Snowden raised a good issue as he deemed it fit to tell the public that silently their rights are being violated by US government.
2. Public showed great response to it and they raised their voices for their privacy .
3. World came to know that US is spying on them.
4. International community started protecting their internet system.