It would be better if you could give us some idea as to what social changes you are talking about. To me, the most important social change in recent years has been the increase in tolerance for people of different ethnicities. I know this is somewhat endangered at the moment because of issues like illegal immigration, but I think it is a huge change.
When I was younger (say in the '70s and '80s) there was much less toleration of ethnic and racial minorities. There was also less toleration of gays. Today's society is so much more welcoming and comfortable for people of color (at least for me). It is no longer in any way acceptable for people to use racially insulting language, for example. Nor is it acceptable for people to use ethnic stereotyping. These are major changes in our culture.
I find the biggest social change to be communication. With Twitter, Facebook, text, email, and instant messaging, we can reach each other faster than ever before for the quick message.
In terms of communication on a mass scale, email programs with extra additions (like Microsoft's Office Docs, or Google Docs) have made sharing large amounts of information highly accessible. The onset of the internet and purchasing power have both made large amounts (like published books) available at a person's fingertips.
This quick communication has made us lazy in relationships, but more efficient in our work... or has it? Does the access to so much information make it easier to use other people's work? Is that cheating or just wise?
Passing information quickly has also allowed for working relationships to experience greater collaborative gains. This might mean that when more is achieved in the workplace, more time can be placed on liesure. This might be an interesting discussion board topic.