Street Fight Daily: 09.15.11

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A roundup of today’s big stories in hyperlocal media, technology, advertising and startups...

Groupon is planning to put its initial public offering back on track even as markets remain rocky. After postponing presentations to potential investors early this month, the online coupon giant is now aiming to go public in late October or early November, according to people briefed on the matter. (New York Times/Dealbook)…

Foursquare’s magical tool that will allow developers to build apps that can remind you to buy milk when you walk past the grocery store or notify you when a friend is in the area is being publicly released. (BetaBeat)…