You browse porn, or you google gun makes and models, or you decide to type "I hate Obama" in a social network status, or you're researching something like I was earlier about teenage mortality rates, which could be considered morbid if you didn't know the context of the research.)
Google, Bing, Yahoo, Twitter, MySpace, every site you'e ever logged into with a password, and Facebook aggregates that data already and now they can voluntarily turn it over to DHS, local law enforcement, DIA, CIA, FBI, NSA, etc.
DHS (or whomever) now has cause (not that they need it now) to ask for your other records. They turn to Google who volunteers all your saved passwords, your email password, your entire google chat histories, every email you've ever sent, and every page you've ever googled (or even visited if you use Google Chrome.)
Now DHS (still with no warrant) can make a phone call to your ISP, who provides your internet. Now they can get packet analysis of every packet sent from your home network by ALL computers on that network.
Even if they find NOTHING, some employee somewhere just snooped through the virtual version of your dresser drawers and diary... But, they found nothng along the lines of what they were looking for. Just for giggles, they CAN bust you for letting your 13 year old download illegal songs and TV shows that you didn't know they were doing ($20,000 fine per song/episode by the way), or share your porn habits with local law enforcement, or contact your employer and ask questions about you because of something they read, saw, etc.
Additionally, whether you did anything wrong or not, they know every single thing you've ever done and can always find out the new stuff with just an email or phone call. No need for warrants. No need for you to even KNOW you've been investigated at all. No one has to tell you. No one has to get a warrant, and you have NO RIGHT to be informed you're under investigation.
That's what CISPA does, worst case. Not to mention the government can't currently share information about you TO businesses (such as Google or your employer). That information is classified. This bill repeals that. Now they CAN tell businesses information about you if they want to or feel they need to.... scary huh? Why the hell would they need that verbage added to ANY bill?
Let's couple that with NDAA and then you get a REAL mixed bag of treats. Now they can snoop on you in real-time and classify you and revoke your citizenship and detain you without due process. That's all with just the two laws they're trying to enact this year alone.