MILAN — Facebook said Tuesday that it would monitor content on its Web site dealing with Prime Minister Silvio Berlusconi of Italy following an attack at a political rally that left him hospitalized.

“Promoting violence, or posting threatening content, is not permitted on Facebook,” the social-networking site said. “We will take quick action to respond to reports, and remove any content reported to us that makes direct threats against an individual.”

Facebook has shut down the largest fan page for Massimo Tartaglia, the man who is accused of hitting Mr. Berlusconi on Sunday with a statuette of the Milan cathedral, after it had amassed almost 100,000 users in less than 48 hours.

Other fan pages with fewer members have remained open. Several hundred people were signing up for one site every hour Tuesday, and by early evening it had more than 8,500 members.

“We’re the largest group still up, how many hours do we have left?” asked one message on the page. Another user responded: “Surely few, but we have shown how many of us stand behind Massimo and that we support his gesture!”

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