Twitter in particular, can mobilise and represent the power of movement with the simple use of the # to collate the voices of millions of people around the world. This can enact raise awareness, spread news, and in some cases enable political revolution.
In Egypt in 2011, Twitter was used to arrange a protest on #Jan25. The protest was against the regime of Hosni Mubarak, who’d been in power for 30 years. The protest was attended by thousands of people and the demonstrations had the desired effect when days later Mubarak stepped down as President of Egypt.
However as Fawaz Rashed pointed out in a tweet, this was not a revolution on social media. Social media was the tool that mobilised the people:
Social media activism is only effective to a point. Eventually the onus is on people to take real world action.