News of the decision quickly spread via social media, which protesters first used to organize anti-Mubarak protests, and has since become an integral part of turmoil in Egypt and across the Middle East. Some protests and demonstrations have been spotted in the capital of Cairo, but they haven't yet reached the scale seen before Mubarak was overthrown.
Some Egyptians and outside observers have been labeling the court's decision a constitutional coup. Many of the court's members are thought still to be loyal to Mubarak. Parliament, meanwhile, includes many members of the Muslim Brotherhood, an anti-Mubarak Islamist group that's running a presidential candidate of its own.
The presidential runoff election is scheduled for Saturday and Sunday.
Below, read a series of tweets and other posts from the immediate aftermath of the court's decision:
[View the story "Egyptian Court Decision Sparks Chaos" on Storify]