Edward Snowden might not be the only former NSA worker blowing the whistle. New revelations concerning an NSA surveillance program called “XKeyscore” seem to point to another source of NSA leaks.

XKeyscore is, according to German broadcaster Das Erste who was one of the first publishers of the story, an NSA surveillance program that logs and tracks any IP address that searches online for programs to make them anonymous. “Merely searching the web for the privacy-enhancing software tools outlined in the XKeyscore rules causes the NSA to mark and track the IP address of the person doing the search.” If you’re paranoid they are definitely out to get you (also if you’re not paranoid).

Tabling for a minute the horror of yet another Constitution-crushing revelation that blows a hole in the Obama Administration’s spin about limited use of surveillance tools on the general public, the information about XKeyscore does not seem to have come from Edward Snowden. Is there a second NSA leaker?

Bruce Schneier, a security expert who worked with parts of the Snowden documents at the Guardian, says he does not believe Snowden is the source.

And, since Cory said it, I do not believe that this came from the Snowden documents. I also don’t believe the TAO catalog came from the Snowden documents. I think there’s a second leaker out there.

“Cory” is Cory Doctorow of Boing Boing who also does not believe Snowden is the source on XKeyscore. Doctorow said he spoke to “another expert” and that “s/he believed that this leak may come from a second source, not Edward Snowden, as s/he had not seen this in the original Snowden docs; and had seen other revelations that also appeared independent of the Snowden materials.”

Is this the much feared Snowden effect? That other workers at the NSA are inspired by his example and have decided to follow in his footsteps and blow the whistle?