Somehow, the Playboys and National Geographics of my generation have all the sizzle of a Disney movie in comparison. Naturally, we turn to technology to shield us from what technology has brought, uninvited, into living rooms, teaching labs and libraries. But the technology of protection itself still is highly imperfect. I know from personal experience. America Online, for example, has a highly rated parental control screen.
Filters are mechanistic.
Most don't disclose the rationale for blocking certain sites. And it's hard for adults to be proactive in a medium that is fluid and constantly changing. Besides, it may not be the Web itself that poses the greatest peril to children. Our biggest concern is the interactive medium. The Web is not going to take your child out of your home and rape her, but someone she meets in a chat room might.