Whenever we say no to something we are theoretically rebelling. It can be as simple as telling your friends you do not want to hang out or telling your girlfriend that you do not want a certain dish for dinner. Even the smallest things in life can be considered rebelling.
Our society is full of rebellions, not the ones that we are traditionally reminded of, but simple insignificant rebellions. Saying no to something, or wearing something that is outside of the social norm are all considered acts of rebellion.
Rebels can look for the best South African Rand rate and then try to sell it at a higher price to make profit, or they can declare that they are an atheist. These are both radically different examples, yet they both still fit within the rebellion framework.
Revolutions do not have to be fought with blood and tears anymore. We can fight for a cause through our social networking pages online. If you become a member of an e-group or join the fight against a certain cause, you are conducting a rebellious act.
Thankfully we live in a society that is free to rebel, even on the smallest level if we choose to. The fact that we have moved from full scale violent revolutions should be considered a good thing.