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Instagram, the hottest iPhone startup right now, isn’t complicated or even revolutionary.

It’s a simple photo-taking and photo-sharing app that has taken over Silicon Valley and is filling our Twitter feed with fun, cute photographs.You can get it for free from Apple’s App Store.

What’s it for

First, Instagram is for taking pictures, adding filters to make them look retro, and then for sharing them with sites like Twitter, Flickr, Tumblr, and Facebook.

And second, it’s a simple social network of other people’s photos. You can “like” or comment on the photos, and see what’s new. It’s easy and doesn’t take much time or effort. This is one of the reasons it has become so popular so quickly.

A Photo-Based Social Networking Feed

The idea behind Instagram seems to be less archive-oriented and more feed-oriented. That is, instead of something like Flickr, which acts as a repository for your photo collection, Instagram is an app from which you share the random photos you snap on your phone from day to day. You can add effects, share your photos with your Instagram followers, and even upload them to other networks like Twitter, Tumblr, Flickr, and Facebook. You can even have it check you into Foursquare when you upload a location-enabled photo. It’s actually a pretty neat app, even if you don’t have any friends on it—browsing through the “Popular” feed is entertaining in its own right. Hit the link to check it out.

Instagram is a free download for iOS, and supports cameras on the 3G, 3GS and iPhone 4.

Why Flickr didn’t create Instagram

Specifically, someone asked the question: Why did Flickr miss the mobile photo opportunity that Instagram and picplz are pursuing? The mobile photo space is red-hot right now with several players beyond the two mentioned vying to become a common app on smartphones. And one of them, Instagram, was able to gain over a million users in less than three months. So why wasn’t Flickr, with all the resources of Yahoo behind them, able to dominate this space first?

The simple answer, according to Elliot-McCrea, is “Innovator’s dilemma”. That is, if Flickr had wanted to create a successful service that leveraged Twitter’s social graph, they would have had to sacrifice their own login system for that of Twitter’s — which until more recently was considered very insecure. “The Yahoo! Paranoids would have shut us down in a heart beat,” Elliot-McCrea says.

Finally,you can find me in Instagram @wintbros.

September 30, 2010 , I  got an iphone 4 from Apple Sotre, Pudong.This is my first time to use IOS and  MR.Jobs did not let me down as expected.Forgive me that share this happy thing with you so late!Please allow me to tell you about the features of iphone4 even everybody knows:

Facetime: People have been dreaming about video calling for decades. iPhone 4 makes it a reality. With just a tap, you can wave hello to your kids, share a smile from across the globe, or watch your best friend laugh at your stories — iPhone 4 to iPhone 4 or to the new iPod touch over Wi-Fi. And it works right out of the box. No other phone makes staying in touch this much fun.

Retina Dispaly: The Retina display on iPhone 4 is the sharpest, most vibrant, highest-resolution phone screen ever, with four times the pixel count of previous iPhone models. In fact, the pixel density is so high that the human eye is unable to distinguish individual pixels. Which makes text amazingly crisp and images stunningly sharp.

Multitasking:iPhone 4 introduces a whole new way of multitasking. Now you can run your favorite third-party apps — and switch between them instantly — without slowing down the performance of the foreground app or draining the battery unnecessarily.¹ This smarter approach to multitasking is available only in iOS 4.

And…so on!I have installed 104 apps on my iphone4, it’s very cool , I can do almost anything on iphone and I will install more and more apps until exhausted.Although I got it for 10 days, but I am still a novice,so,I will share more  future skills of iphone4 with you!