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Facebook's $1 billion bid to buy the Silicon Valley map darling Waze has reportedly fallen through, and COO Sheryl Sandberg insisted on Wednesday that Facebook isn't getting into proprietary Facebook mapping software. So how can the social network get in on the startup world's high-stakes space of the moment now that the perfect buy has vanished?

"It would be great if we could build an awesome map," Sandberg told Kara Swisher and Walt Mossberg at All Things D's D11 conference this morning. "But we're not going to do that." As too many tech companies learned by way of Apple's fumble late last year, making your own map app from scratch is a more difficult endeavor than Google ever made it look, so that's out. But Sandberg didn't deny that Facebook needs to double down on the location-based game: "We have to prioritize ruthlessly," she said, suggesting that Facebook might be looking for another mapping technology to scoop up. Here are a few options, all of which would be cheaper than Waze — and some of which might take the social network in a very promising new direction.