You mean the one you would hand write on a photo and stick in your photo album at home, compared to the autotagging facial recongition can do and then advertise (possibly publicly) to all of the users friends via status and wall updates?
and you're ignoring the larger picture of wanting the general public to stay so up to date and informed about the workings of the internet and the latest exploits that they should be able to take on and protect themselves from the companies that base their entire business model around exploiting their software and hardware weaknesses. Then again, you didn't actually reply to how incognito mode has been rendered useless.
but its interesting how you draw a line between viruses, even nonharmful ones, and data harvesting from browsing habits.