Nassau County police said a 17-year-old boy, who was apparently fed up, went to the home of another teen -- 17-year-old Anthony Vas -- to confront him over posts made on Instagram. Vas lives on S. Hewlett Avenue in Merrick.
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Police said the two teens got into an argument, during which Vas pulled out a 5-inch steak knife and stabbed the victim, 17-year-old Frankie Bruno, in the chest.
This stabbing was the culmination of a long-running feud between the two teens, police said.
Bruno fled and was later taken to the hospital for emergency surgery. He is in stable condition and is expected to make a full recovery.
Classmates said the confrontation followed a dispute about a girl that played out on social media.
But police would not confirm those details. They only said the victim was reacting to a specific post on Instagram.
"It's a form of harassment and it was concerning," Det. Lt. Rich Lebrun of the Nassau County Police Department said.
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Vas was arrested at his home without incident. He is facing charges of assault and criminal possession of a weapon.
VIDEO: Police escort suspect in social media stabbing
He is expected to be arraigned Thursday in Hempstead.