What kind of shared experiences are there in the online world and what are some of the issues surrounding this 'global media'?

the experiences that are shared in the online world can be shared views and likes and dislikes through communitcation via facebook, twitter, youtube and my space. people can communicate though skype and can share their experiences with the world. the issues of this are that privacy and confidentiality is sparce and as we have seen in catfish no one can be trusted with communications.