All
If you want to know what laws make PRISM and other programs possible, as well the technology for how the gubmint swallows up everyone’s information go here
http://www.freerepublic.com/focus/news/3031768/posts?page=79#79
As you state, Snowden didn't really reveal anything new, other than confirm for LIVs that fed.gov has been violating our rights for decades. (As such, then what crime(s) did he commit?)
Anyway, I'm sure various pols & pundits who wish to become better informed on the extent of this corruption would really find your primer quite useful.