PRISM, based on the data available, is all about consuming data WITHOUT a warrant -- vacuuming data associated with identities that are not associated with ANY identities subject to a court order. Violating laws and possibly (USA) constitutional rights in quite a few ways. PRISM likely exists.
I ask of "sneak" to confirm their assertion that "PRISM == FISA orders" is true. Please present this "evidence" and the evidence of connection. If you cannot you are, by default, distributing mis-information, bad logic or at worst tying to mislead.
(my naive searching suggests that "sneak" is definitely not in a position to make these claims)