I read about this briefly during the election, but this article goes more in depth.
In Spain, however, the objectives were more concrete. Political demonstrations are officially banned in the 24 hours preceding the voting. But this time, activists came together anyway, as millions of text messages and e-mails circulated. Though Spain has relatively few Internet users, its mobile phone penetration, at 94 percent, is among the highest in the world, according to the market researcher Gartner.
On March 13, the day before the elections, text-messaging traffic was 20 percent above the normal rate, the Spanish daily El País reported, citing industry sources; on election day, it was 40 percent higher.
This phenomenom was also responsible for the enormous turnout February 15, 2003, when millions of people demonstrated worldwide against the Bush invasion of Iraq.
Viva la revolución!