Staying one step ahead of the proliferation of large-scale meetups organized on social media that descend into violence has become a challenge for police on Long Island and NYC, law enforcement experts say. The most recent example occurred when a 15-year-old boy was killed and two men were wounded at Eisenhower Park in East Meadow during what Nassau Police Commissioner Patrick Ryder described as a "so-called barbecue" for members of "a Blood gang group" that had been promoted on social media. And the shooting comes amid a wave of social media-inspired gatherings in recent years on Long Island that quickly transformed from mundane to chaotic, including a "takeover" of Green Acres Mall and huge crowds of youths that assembled in separate incidents at Jones Beach and Long Beach that turned violent. More at the link in bio. (Photo: Jim Staubitser) . . . #longisland #longislandny #nassaucounty #suffolkcounty #nassaupd