Music. Vacations. Worms. Games. Movies. Family. Instant Messenger. Salary negotiations by e-mail. Porn. Kiddie porn. Debate. Blogs. Harassment. Politics. "Did you hear? Jane just had surgery." Free speech. Patriotism. "Did you see this New Yorker cartoon I scanned?" Sexual harassment. Catching up with friends. Stalking. Some of this is OK. Some of it isn't. The borders are hard to define, aren't they?