When all the PRISM news broke, it didn't take long for the US Government to fess up. President Obama even made a (bummer of a) statement on it. Now, Director of National Intelligence James Clapper has put out an official fact sheet about what PRISM is and isn't, according to the US Government. Think of it like an official FAQ.
The document echoes a lot of the cold comforts present in the President's statement, specifically: this is legal and Congress is cool with so just chill out everybody, gosh.
Like the tech companies reportedly involved, the document explicitly denies that anyone is out there unilaterally collecting information the servers of service providers. An assurance that directly conflicts a PRISM side leaked earlier today by The Guardian. [Office of the Director of National Intelligence via Marketing Land]