What Mubarak might not have known is that while he was trying to maintain his iron grip on power, thousands of Egyptians were tweeting about their frustration with the dictator. Eventually, the people on the street, armed with nothing more than a cell phone and a free social media site, changed the course of history. If you are a middle or high school social studies teacher, and you wanted to provide your students with a close-up view of the events unfolding in Egypt, you could turn to a traditional news service. Or, you could follow the hashtag #Egypt on Twitter and tap into the real-time pulse of unfolding events by people on the streets of Cairo.