For those that don't want to actually read the loose blog post (its just an opinion from some unknown guy and backed up with no actual facts by the way. It's not actually news at all).
In the comments is a reply apparently from DuckDuckGo :
"Hi, this is Gabriel Weinberg, CEO and founder of DuckDuckGo. I do not believe we can be compelled to store or siphon off user data to the NSA or anyone else. All the existing US laws are about turning over existing business records and not about compelling you change your business practices. In our case such an order would further force us to lie to consumers, which would put us in trouble with the FTC and irreparably hurt our business.
We have not received any request like this, and do not expect to. We have spoken with many lawyers particularly skilled and experienced in this part of US and international law. If we were to receive such a request we believe as do these others it would be highly unconstitutional on many independent grounds, and there is plenty of legal precedent there. With CALEA in particular, search engines are exempt.
There are many additional legal and technical inaccuracies in this article and I will not address all of them in this comment. All our front-end servers are hosted on Amazon not Verizon, for example."