Web 2.0 is essentially all about the internet developing to allow more interaction. It has evolved from chat rooms, to message boards, to today's social networking sites and content sharing sites, like Facebook and Youtube. I think web 2.0 has affected society in innumerable ways. To touch upon a few, it has certainly made the world smaller. In previous generations the majority of people did not interact with people in other countries and perhaps not even in other states, counties or cities. But thanks to the internet, people from all over the world can come together to share ideas exchange products and information. web 2.0 has also forced corporations to adapt and use the new tools at their disposal. It is not uncommon for corporations to have Twitter accounts, Facebook pages, or videos posted on Youtube.
Some may argue that web 2.0 has destroyed true social interaction. While this may be true for some, I believe that for most it has improved it, and added another avenue for communication, not replaced person to person interaction. And, in fact, it has created opportunities for interaction that otherwise would not have existed, and in that sense, it has improved social interaction.