It applies to anything that changes the way society operates. I think you might be confusing "society" with "social".
Societal changes are made when anything changes. A new shopping center makes travel for food easier. A new leader brings societal change. For some, it might be entrance to the EU or a more open use of the internet. Laws, politics, education, new buildings, a new train line. All of it counts to societal changes. Social change is a bit different. Like accepting intercultural marriage or same sex relationships.
I hope this helps,