How did such a hopeful moment turn so sour? Here are some observations from a trip to Cairo last month, and conversations since.
First, Facebook alone does not make a revolution. Liberal Facebook activists such as Maher were able to rally urban, educated crowds. But they were unable, or unwilling, to organize among the poor and less educated in rural Egypt, where shoe leather was needed. Nor were they able to organize strong political parties to counter well-organized Islamists. As the 25-year-old liberal activist Mohebi Doss told me over coffee in the legendary intellectuals' Café Riche in Cairo: "The Muslim Brotherhood succeeded in reaching power because of liberals' mistakes."
Second, after the Muslim Brotherhood had frightened many Egyptians by seeking to monopolize power and Islamacize society, young activists again tried to unseat a government with street protests. Doss was one of five founders of the group Tamarod (Rebel), which campaigned to gather 15 million signatures calling for the resignation of elected President Mohammed Morsi, a Brotherhood member. "We had to do it this way," says Doss, "because we couldn't defeat the Brotherhood in elections."
Military officials, sensing the public's dissatisfaction with Morsi, helped organize and publicize the Tamarod campaign, which included a massive anti-Morsi demonstration. Tamarod provided the generals with the cover to oust the president last summer and reinvent themselves as the heroes of the Egyptian revolt.
Third, most - but not all - liberals welcomed the army's soft coup despite its brutal crackdown on the Brotherhood, in which hundreds were killed and thousands arrested. Conscious of their political weakness, liberals hope the army will move the country back toward democracy in coming elections. However, a new constitution strengthens the power of security services. And public adulation for Gen. Abdel Fattah el-Sisi, who removed Morsi, may ensure he is elected as the next president.
Fourth, the military and police seem bent on ensuring that the Egyptian street - so powerfully mobilized by the Tahrir revolt - will not unseat another government.
As a result, liberal activists who have dared to raise human-rights objections to military behavior or new curbs on street protests have found themselves in the crosshairs. Maher, who has met with prominent leaders in Europe, America, and Asia, and been nominated for a Nobel Peace Prize, is now locked up in a freezing cell in solitary confinement.
This month legal charges were also brought against prominent liberal political scientist and ex-parliamentarian Amr Hamzawy, and the well-known scholar Emad Shahin, who were among the few public critics of the bloody crackdown on the Brotherhood. Those who know the men well - and I am familiar with both - call the charges laughable, if not absurd.
Meantime, state media continue to defame onetime rebel icons, claiming that the Tahrir Square revolt was really organized by "foreign hands" and Maher and colleagues were foreign agents. (They also accuse the Brotherhood of terrorism; regardless of the group's mistakes, these charges have little or no basis in fact, according to top terrorism experts.) In a country where many have no access to the Internet, state TV is a powerful tool for selling the new narrative. In addition, pesky foreign journalists are being jailed.
Even Khalid Saeed, the young man whose brutal death at police hands in Alexandria sparked the original Tahrir revolt, is no longer sacrosanct. I was told by one military source in Cairo, "Don't be fooled into believing Saeed was a good guy."
"Our own history is being rewritten by an alternative reality," says Hossam Baghat, one of the most courageous human-rights advocates in Cairo. "And this rewriting of history is relentless."
However, as Baghat points out, public opinion is very fluid. If Egyptians elect Sisi as president, they will eventually judge him not on his current hero status but on whether the economy gets better.
If he fails to deliver, we will see whether the spirit of Tahrir lives on and people dare to return to the streets to demand a different leader. Or, even more important, whether the heirs of Tahrir have been able to organize an independent political party, and whether such a party can - or is permitted to - win.