
Mobile Q&A App Opinionaided Has Generated 90M Responses To Over 1.2M User Questions

Opinionaided’s free iOS app allows users to get advice and opinions on the fly. Within the app, users can input a question, determine a category (i.e. relationships, politics) and submit it for other Opinionaided users to answer. You can also publish your questions to Facebook and Twitter. After a question is posted, fellow Opinionaided users can comment on the question and the app will calculate the percentage of users that responded positively or negatively. From there, consumers can reply back to the comments or create a new question for peers to vote on.

So what’s driving this much growth in users and engagement? Opinionaided founder Dan Kurani says that the ability to get realtime feedback at the point of decisionmaking is helping drive usage growth. On average it takes less than 2 minutes to get your first 10 responses to any question, says the company. And the simplicity of the app makes it appealing as well.

Interestingly, the average age of the Opinionaded user is 24, so perhaps usage also skews to a younger audience that is more engaged on devices like the iPhone. And while Opinionaided offers a web platform, Kurani says the company is seeing 90 percent of engagement on mobile.


Hacker News  How I Failed, Failed, and Finally Succeeded at Learning How to Code

while i like project euler, i find rosettacode to be more downtoearth. in everyday life you’re much more likely to have to solve rosettacode’s tasks (eg download a page from the web, parse something, generate a bitmap, send a mail) than project euler’s mathbased tasks.


How I Failed, Failed, and Finally Succeeded at Learning How to Code – Technology – The Atlantic

Now you have two rectangles, each cut diagonally in half by a leg of the triangle. So there is exactly as much space inside the triangle as outside, which means the triangle must take up exactly half the box!
This is what a piece of mathematics looks and feels like. That little narrative is an example of the mathematician’s art: asking simple and elegant questions about our imaginary creations, and crafting satisfying and beautiful explanations. There is really nothing else quite like this realm of pure idea; it’s fascinating, it’s fun, and it’s free!

This is why it is so heartbreaking to see what is being done to mathematics in school. This rich and fascinating adventure of the imagination has been reduced to a sterile set of “facts” to be memorized and procedures to be followed. In place of a simple and natural question about shapes, and a creative and rewarding process of invention and discovery, students are treated to this:
“The area of a triangle is equal to onehalf its base times its height.” Students are asked to memorize this formula and then “apply” it over and over in the “exercises.” Gone is the thrill, the joy, even the pain and frustration of the creative act. There is not even a problem anymore. The question has been asked and answered at the same time — there is nothing left for the student to do.

The problem itself is a lot like Lockhart’s triangle question — simple enough to entice the freshest beginner, sufficiently complicated to require some thought.

All it takes is a little hunger. You just have to want the answer.

That’s the pedagological ballgame: get your student to want to find something out. All that’s left after that is to make yourself available for hints and questions. “That student is taught the best who is told the least.”

Project Euler, named for the Swiss mathematician Leonhard Euler, is popular (more than 150,000 users have submitted 2,630,835 solutions) precisely because Colin Hughes — and later, a team of eight or nine handpicked helpers — crafted problems that lots of people get the itch to solve. And it’s an effective teacher because those problems are arranged like the programs in the ORIC1’s manual, in what Hughes calls an “inductive chain”:

This is an idea that’s long been familiar to video game designers, who know that players have the most fun when they’re pushed always to the edge of their ability. The trick is to craft a ladder of increasingly difficult levels, each one building on the last. New skills are introduced with an easier version of a challenge — a quick demonstration that’s hard to screw up — and certified with a harder version, the idea being to only let players move on when they’ve shown that they’re ready. The result is a gradual ratcheting up the learning curve.

On top of this there is one brilliant feature: once you get the right answer you’re given access to a forum where successful solvers share their approaches. It’s the ideal time to pick up new ideas — after you’ve wrapped your head around a problem enough to solve it.

This is also why a lot of experienced programmers use Project Euler to learn a new language. Each problem’s forum is a kind of Rosetta stone. For a single simple problem you might find annotated solutions in Python, C, Assembler, BASIC, Ruby, Java, J and FORTRAN.

The first is that it’s naturally addictive. Computers are really fast; even in the ’80s they were really fast. What that means is there is almost no time between changing your program and seeing the results. That short feedback loop is mentally very powerful. Every few minutes you get a little payoff — perhaps a small hit of dopamine — as you hack and tweak, hack and tweak, and see that your program is a little bit better, a little bit closer to what you had in mind.

The second feature, by contrast, is something that at first glance looks totally immaterial. It’s the simple fact that code is text.


MobileNotifier Does iOS Notifications Right, Will Make You Want To Jailbreak

腾讯电商帝国：低调布局内部展开人事大调整_互联网_科技时代_新浪网

国内知名互联网专家吕本富亦表示，在任何电子商务交易过程中，支付经验、运营经验以及制定交易规则都需要长时间的积累，腾讯的优势在于沟通和游戏，想无缝嫁接到电子商务上面还是很困难的。

随着腾讯平台的逐步开放，其独特的电子商务战略开始浮出水面，而其中，被腾讯高层重点描绘的是一个正在积极酝酿中的B2B2C的巨型平台。
一位知情人士称，腾讯希望能够将当下众多的B2C平台集中到腾讯的大平台下，腾讯将在每个垂直领域选择一个投资对象，如鞋类B2C为好乐买，3C产品则已经有易讯等，这些子平台集合成为一个庞大的B2B2C平台，腾讯将对它们给予全力的帮助和资源支持，腾讯未来还有可能建立统一的呼叫体系、支付体系、物流体系。但和完全开放并不一样，这将是一个封闭开放的平台，仅是对其所投资的平台开放，而被投资的B2C也无需担心腾讯的强力控制，能够继续拓展其自有的其他销售平台。

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