As bombs blasted Baghdad last week, dozens of cell phones in China buzzed with messages about where to stage an anti-war protest.

In Cairo, activists tapped out text messages to summon 5,000 demonstrators to a central square. And in San Francisco, technophiles beamed live footage from protests to anti-war Web sites.

Throughout the world, technology is allowing activists to stage spontaneous rallies in reaction to the war.

Prohibitively expensive only a few years ago, gadgets ranging from the cell phone to the mini digital video camera simplify protests from Brussels to Manila.

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