They have already been spying on all Social Media Sites for quite a while. They had to get the court's permission to do it, but they spied on the conversations between Megaupload before they took them down.
They decided they didnt want to go through all that process again to get permission, so they new CISPA act was brought in to allow them to do it,,,,to cover piracy & terrorism (that was their reasons to put it through).
Read my previous warnings on this;
FBI Wants To Spy on You
CISPA Spying Act