Today's subject is more modern dangers. Let's begin with the sadly not shocking observation that "Private browsing: it's not so private." Among the problems, browser plug-ins often fail to respect private mode.
Omitted from the discussion: no matter how robust your browser's privacy mode, your ISP knows by IP address what data goes to and from your home. (Your browser may warn you of this risk -- for example, Firefox pops up an advisory at the start of every FF private-browsing session.) Perhaps you choose to route your web accesses through an anonymizer service. If so, why do you suppose that service is any more likely to respect/protect your privacy than your ISP?
Are you unhappy that someone might poke around your Internet activities? How about foreign powers poking around inside your nation's IT infrastructure? We've already seen cyberwar incidents involving Georgia, Estonia, and Iran, and many incidents of Chinese hackers poking about inside US networks. (Last January I posted here about cyberwar.) Conventional wisdom has it that the country which would be most at risk in a full-blown cyberwar is the US -- we are, after all, the birthplace of the Internet, and so have become the most dependent on it. So: it's good to finally see that "US Cyberwar Guidelines Officially Signed." Hopefully implementation will entail less dawdling than did drafting and signing ...
As a US military official is quoted by the WSJ in "Cyber Combat: Act of War":
"If you shut down our power grid, maybe we will put a missile down one of your smokestacks."
In the realm of tech and automation run amok, consider widespread facial recognition. Consider software concluding from your state DMV photo that you aren't you. (Does anyone's DMV photo look like them?) Having concluded you're misusing your own name, clearly you're guilty of identity shenanigans. What to do, what to do? Here's a thought! Let's, without recourse, revoke your drivers license.
Far-fetched? A risk only in some remote future? Hardly. Per "Here's Looking at You, and You, and You ..." we're already there (at least in the state of Massachusetts).
The flip side of privacy problems is secrecy problems. Underground hacking groups Anonymous and Lulzsec worry more about the secrecy side. They've been all over the news so I'll go to something more mundane and more directly affecting your daily life: private data monopolies. Such as ...
The days are long gone when individuals could maintain their own cars and trucks. Now independent repair shops face being locked out of the business, too, as car manufacturers hoard information (like the diagnostic codes essential to maintaining vehicles) to favor dealership service departments.
At last! A solvable problem, and again Massachusetts takes the lead. See: "Auto Right to Repair Act Fight Heats Up."
And scariest of all, half the world's population confronts cyber-Armageddon. See: "Not Tonight, Honey: Women Choose Internet Over Sex."