The thing about New Media is that anything and everything is easily distributed online. Including private information, pictures, and videos. Many people forget how easy it is for something incriminating or embarrassing can be spread around the internet by friends or complete strangers. This can easily lead to serious consequences, such as bullying, harassment, employment termination, and if you are well known in the real world or even virtual world it could result in harsh criticism by people all over the world.
Of course those aren't the only privacy concerns. There is also matters containing to finance and identity theft. Some websites sell the personal information they gather from people opening accounts, which causes a lot of unwanted junk mail or spam email. And in the case of security breaches such as someone stealing the data off of new media website's servers or hacking their servers, they can do a lot of harm with that data.
So confidentiality is clearly a must have for many websites. The websites should have sufficient security and data encryption to prevent people from stealing that data. And the websites should have clear privacy policies stating what they intend to do with any personal information they gather.