From Media consumer into participants

This topic that was covered in the last lecture has very good points about how the new form of media can be used as an advantage . The article included in the lecture also made me comprehend that the participants are more and more into sharing their personal information publicly on the internet. Only "tourists" will feel uncomfortable sharing their information through the internet. But when i think about it, i wonder why it is like this. Why do most inhabitants of the internet have no problem posting their personal information on the internet for everyone to see? Perhaps they are more confident about themselves and have an attitude that "Either you like it or you don't. And if you don't you can get the F*** out of here". Who knows... food for thought