Egypt has erupted on the news that President Mubarak has stepped down, and the internet is abuzz with messages of congratulations and joy.While Egypt's future remains somewhat uncertain, the tremendous joy felt across the internet is easily apparent. "Congrats Egypt" is a trending term on Twitter, and feeds are overflowing with descriptions of celebrations in the streets.See some of the best Tweets below, describing the overwhelming sense of pride and joy on the streets of Cairo and in Tahrir square.Read More... More on Egypt Twitter