I just heard a BBC news spot where one of the interviewees, a law professor if I recall correctly, indicated that the support for CISPA by Facebook and other prominent startups was in order to provide legal cover for just these types of requests.
Under current rules, it was stated, while these companies can be pressured by the FBI to release certain info and give certain access, they have no immunity from litigation - so they can still be sued for complying with the requests by their users and other concerned parties.
The interviewee indicated that CISPA gives them the legal immunity they need so that they can comply with the FBI while being able to fend off potential lawsuits.
Under current rules, it was stated, while these companies can be pressured by the FBI to release certain info and give certain access, they have no immunity from litigation - so they can still be sued for complying with the requests by their users and other concerned parties.
The interviewee indicated that CISPA gives them the legal immunity they need so that they can comply with the FBI while being able to fend off potential lawsuits.