It’s official: The Facebook-owned photo application Instagram has reached 100 million users. Chatter regarding Instagram’s decline has been tooling around the web ever since the service was acquired by Facebook in a deal that was first reported almost a year ago. But since then, the service has also undergone a PR firestorm because of modifications to its terms of service, a bad decision that some said had removed from Instagram 25 percent of its daily user base. It is true that both the acquisition and the terms faux pas did cause lots of users to stray to other photo-sharing sites, but despite these rumors and persistent user backlash over the associated changes, Instagram said it was seeing no signs of slowing.

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Apple (NASDAQ:AAPL): Current price $446.05

The analyst Gene Munster at Piper Jaffray says that domestic Mac sales experienced an impressive spike in January because Apple probably satisfied some of the gigantic demand it had seen for its redesigned iMac in the fourth quarter. Mac sales were off by 17 percent in that quarter, a loss that Apple credited mostly to a lack of availability of the new iMacs. Specifically, Apple sold 4.1 million Macs in the last quarter of 2012, which was down from 4.9 million year-over-year from 2011. Chief Executive Tim Cook acknowledgeded that iMac sales were down 700,000 units in the same period, a reduction that would comprise most of the 800,000 fewer Macs Apple sold in the quarter.

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Google (NASDAQ:GOOG): Current price $802.68

On Tuesday, the Defense Department unveiled a new plan for stepping up the adoption of  both secure classified and unclassified mobile devices, along with applications. One component of the Department’s plan will be to shift away from its current BlackBerry standard and towards a more “platform agnostic” policy, integrating devices running Google’s Android operating system, as well as Apple’s iOS. A representative from the Department told AppleInsider that this does not mean a total abandonment of BlackBerry’s platform.

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QIHOO 360 Technology Co. (NYSE:QIHU): Current price $30.53

A month ago, Apple removed applications from the Chinese Internet services and security software supplier QIHOO 360 from the iTunes App Store, but the apps have thus far not been reinstated. Recent industry chatter has it that Qihoo is thinking about abandoning the App Store altogether. An inside source said that the company had sent out its Vice President of Channels, Li Tao, to visit Apple headquarters after the de-listing, but that Li was not received at Apple HQ. Perhaps in response, Qihoo Chairman Zhou Hongyi is said to have decided to abandon the iOS market.

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