It's a little bit creepy, but it's also a little bit genius. Singles for Foursquare builds a dating and messaging service on top of the location-sharing application. The result is a mashup that could match up hip iPhone-using, Foursquare-playing, same-bar-going early adopters.
With 25 million business listings over nine countries, open data company Factual has taken a first step toward creating a place database to which anyone can contribute. With location-based applications now more popular than ever, the data is extremely valuable to developers. Factual is providing it via its API, currently for free.
At Mashup Camp last week each attendee was given one wooden nickel with which to vote for their favorite mashup. Then on both days there was a "Speed Geeking" session during which attendees rotated through the Great Hall getting 5 minute demos from each of the 20+ mashup contestants.