PRISM = FISA - it's just the NSA code name for data collection under the Foreign Intelligence Surveillance Act of 1978. All tech companies were involved, because to do otherwise would've been illegal.

The press cycle around the Snowden declarations made it seem like the big tech companies were in bed with the government, but honestly they hated it as much as you did, and in many cases the programs had different names within the NSA from when they interfaced with the companies involved, or were done entirely without knowledge of those companies.