"I guess Facebook is like yelling it out to a crowd, and then Twitter is just like talking in a room."
The Press Complaints Commission in the UK has now ruled that there is no "reasonable expectation" of privacy on Twitter. With this decision and the fact that teenagers are flocking to Twitter in a big way, frustrated adults are asking the same questions of teen Twitter feeds as they did of MySpace and Facebook: don't young people know this stuff is public? Why do they put personal things online? Why don't teens care about privacy?
First, let's get something straight: not all teens use Twitter, and those who do don't all use it in the same way. The sense of what's appropriate on Twitter varies wildly by social group and locale – is it OK to break up with someone on Twitter? To tweet a hundred times a day? Similarly, young people use Twitter in different ways.