LocalResponse, a new startup in the social media mobile ad space, is using semantic analysis to capitalize on real-time social data: “LocalResponse was born out of the ashes of Buzzd, a city guide that mashed up Foursquare and Twitter to help users find local hotspots. Founder Nihal Mehta learned a valuable lesson in defeat, and this week raised a $5 million round… Buzzd was a consumer facing platform, but failed to attract enough users. LocalResponse, by contrast, take the massive amount of public data being shared on Facebook, Twitter and Foursquare, and turns that into ad inventory.”