Commercial accounts for businesses on Twitter may finally make their debut next month at the company’s inaugural developer conference Chirp. Anamitra Banerji is leading a session on commercial accounts in the afternoon at the conference. Last summer, co-founder Biz Stone told us that the company was planning to launch a commercial layer over its ecosystem by year-end

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Twitter’s commercial accounts may finally land at Chirp conference next month
Plastic Jungle , a site where you can sell unwanted gift cards or buy those cards at a discount, has raised $7.4 million in a second round of funding. I actually wrote about new site with a similar idea called CardPool just a few hours ago. Both CardPool and Plastic Jungle are part of a larger category of gift card marketplaces , which also includes Swapagift

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Gift card swapping startup Plastic Jungle raises $7.4M
Steve Chen, co-founder of the wildly successful video sharing site YouTube, sold the site to Google in October 2006 for $1.65 billion. No doubt he’s since internalized Google’s “Don’t be evil” ideology, at least as a talking point

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YouTube founder pushed for growth “through whatever tactics, however evil”
The mobile app market is heating up, both for paid and free apps. And we’re seeing numerous app developers and content publishers jumping into the market every day looking to make money on this opportunity. If you can get consumers to pay for your app, great.

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Four ways to make money “selling” free mobile apps
Kaltura , developer of an open source video platform, has joined with the Wikimedia Foundation and the Open Video Alliance to launch two initiatives to promote HTML5 video on the web. HTML5 is the latest revision of HTML (HyperText Markup Language), the programming language that makes up most of the web. It’s being looked at as a challenger to Adobe Flash in many ways, since it allows for web animations and video without the use of a plugin.

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Open source video company Kaltura joins with Wikimedia to promote HTML5 video
CardPool , a new startup incubated by Y Combinator , helps users get money for gift cards that they don’t want. Now it’s also offering a financial incentive for those users to recruit their friends

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Gift card marketplace CardPool pays users to recommend friends
At a certain point in BioShock 2 , I figured out what I needed to do to win the video game. I had to hypnotize the enemies so that they would shoot each other and not me

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BioShock 2: Great game hurt by a special trick that is too powerful and addictive
Amazon has finally released a version of its Kindle ebook reading software for the Mac . The company previously released a Kindle app for the iPhone a year ago, and has plans for an iPad version of the software as well.

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Amazon releases Kindle ebook reader application for Macs