Seems significantly more likely than what was claimed in the original story:

1. The NSA using monitoring technology against civilians in the country, against their charter. 2. County sheriffs deputies who are members of the Joint Terrorism Task Force obtaining this classified information from the NSA 3. Aforementioned county sheriffs accidentally divulging said classified data

I'd listen to an argument that points 1 or 3 occurred. Point 2? Way more likely that somebody read facebook than interagency communication of classified data from a classified program to a local law enforcement officer with no security clearance.