Facebook users have surpassed 500 million worldwide.

This isn’t the first time it was reported that authorities nab criminals with the help of Facebook.

But closer to home, in the Philippine police tracked down a suspect in a series of grisly robberies and killings with the help of his Facebook account, officials said Tuesday.

Mark Dizon, a 28-year-old computer technician, did not resist when arrested Tuesday while talking with his father in a public square in northern San Fernando city, police Senior Superintendent Danilo Bautista said, reports AP.

He is accused of killing nine people — six Filipinos, an American, a Canadian and a Briton — in three different robberies at hotels and homes this month in Angeles city.

The area, near the former U.S.-run Clark Air Force Base some 50 miles (80 kilometers) northwest of Manila, is home to many retired expatriates.

Dizon, who is from a well-off family and according to police had a fascination with guns, was Facebook friends with the daughter of one of the victims. A friend of her family showed his photo on the popular social networking site to witnesses to help identify him, police said.

“He was fond of computers and this gave him away,” Bautista told The Associated Press.

Murder charges will soon be filed against Dizon, who denied involvement in the killings, Bautista said.