So if the feds are investigating one of your Facebook/MySpace/Twitter buddies, they could very well be investigating you. And if they're adding you to that "social map," what about your friends? At what point does the map stop? Does it even have borders?

Another key question: If an agent violates a service's TOS, is the evidence he or she gathers admissible in court? The documents ask this question; unfortunately, they don't answer it, nor do they explicitly state anyone is doing this.

Still, you gotta figure they are. Cops have been infiltrating "suspicious" organizations for years, mostly with good intent, . It's natural to assume they'd do it in the virtual world, but in the past you had to be an active member of such an org to fall under suspicion; now all you need to do is say yes to the wrong friend request.

I know what some of you are saying: "I never use Facebook/Twitter etc, so I'm not worried." But not using these things is not an option for many of us; that's like saying "I never use a phone because it might be tapped." (By the way, .) It's also a little like saying, "I only use a typewriter because computers are the devil's spawn."

The only logical response is to be a lot less cavalier about the information you share and with whom you share it. So let's just say it: The social networking honeymoon is officially over. Time to get a lot more serious about what we do and don't do online.