Hundreds of teens flocked downtown on a Friday in late November after word of a takeover circulated online. The city allocated 700 officers, but it didn't stop the violence from happening: a 14-year-old was shot and killed just blocks from where the city's tree lighting ceremony occurred only hours earlier.

Social media plays a role in the teen takeovers, with the information typically spreading online, 6th Ward Alderman William Hall said. He introduced an ordinance Wednesday to help establish a system to combat the spread of the posts.

"When you have thousands of kids sharing where to meet up to do some violent acts, if those accounts were not sharing it, then the question becomes would the information have gotten out as fast?" Hall said.

Hall said he's had conversations with Chicago

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