Interviewer: Do private companies help the NSA?
Snowden: Yes. Definitive proof of this is the hard part because the NSA considers the identities of telecom collaborators to be the jewels in their crown of omniscience. As a general rule, US-based multinationals should not be trusted until they prove otherwise. This is sad, because they have the capability to provide the best and most trusted services in the world if they actually desire to do so. To facilitate this, civil liberties organizations should use this disclosure to push them to update their contracts to include enforceable clauses indicating they aren't spying on you, and they need to implement technical changes. If they can get even one company to play ball, it will change the security of global communications forever. If they won't, consider starting that company.
Interviewer: Are there companies that refuse to cooperate with the NSA?
Snowden: Also yes, but I'm not aware of any list. This category will get a lot larger if the collaborators are punished by consumers in the market, which should be considered Priority One for anyone who believes in freedom of thought.
For the full Cryptome article: http://cryptome.org/2013/07/snowden-spiegel-13-0707-en.htm