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Foursquare CEO Dennis Crowley doesn’t think that you should have to open up a mobile app to interact with it. I caught up with Crowley a couple days ago at the Web 2.0 Summit, where he was a speaker. In the video interview above, he compares Foursquare’s newest feature called Radar to the Siri personal assistant on the new iPhone 4S. For Crowley, it’s all about getting mobile apps to push relevant information out to you at exactly the right place and time. “If you have a problem to solve with your phone, you don’t have to go to the search box.”

Radar taps into Foursquare’s Explore recommendations and pushes them out to you automatically via notifications. “What we have been doing with Radar is finding a way for people to use the app really without having to actually use it,” says Crowley. It runs Explore in the background, which tells you when you are near a place on your to-do list, where someone you know has left a tip, or where a lot of your friends are at that moment. Siri is similar in that it pushes out reminders and other information to you without you having to tap on the screen.

In part II of this interview, coming up, Crowley talks about how Radar fits into his overall strategy and plans to make money.

Mobile device usage has spread across the globe. In terms of mobile penetration, the United States is actually on the lower end of the worldwide spectrum, with only 77% cellular device ownership. That seems counterintuitive to the way the U.S. views itself as the heart of mobile acceptance and innovation. It is China and other Asia-Pacific countries that really lead in mobile adoption. Research firm Forrester released a study last week showing global mobile usage trends. In almost every mobile usage aspect, metropolitan China and other Pacific Rim countries lead the way. That includes mobile social usage, work usage and multiple device ownership. Mobile is near an inflection point, changing the way people interact with information around the globe.

If keeping a food diary seems like too much effort, despair not: computer scientists at the Harvard School of Engineering and Applied Sciences (SEAS) have devised a tool that lets you snap a photo of your meal and let the crowd do the rest.

PlateMate's calorie estimates have proved, in tests, to be just as accurate as those of trained nutritionists, and more accurate than the user's own logs. The research was presented at the 24th ACM Symposium on User Interface Software and Technology, a leading conference on human-computer interaction.

“We can take things that used to require experts and do them with crowds,” says Jon Noronha ’11, who co-developed PlateMate as an undergraduate at Harvard and now works at Microsoft. "Estimating the nutritional value of a meal is a fairly complex task, from a computational standpoint, but with a structured workflow and some cultural awareness, we've expanded what crowdsourcing can achieve."

Get Glue:

In their first three months, 1 million users, 100 million data points and shipped out thousands and thousands of stickers. Amazing, but how on earth are they making profit? Because it’s an advertising platform and collecting information on demographics, popularity, etc. and providing the entertainment industry with amazing data – sold.

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