Facebook value gets tougher look

(PhysOrg.com) -- For most technorati ineligibles, it seemed like Wacky Math in the way that dollar signs were being placed on the value of startups in the heyday of the first dot.com bubble. When the bubble burst everyone ...

Expanding Antarctic sea ice linked to natural variability

The recent trend of increasing Antarctic sea ice extent—seemingly at odds with climate model projections—can largely be explained by a natural climate fluctuation, according to a new study led by the National Center for ...

Twitter unseals IPO papers, hopes to raise $1B

Twitter has unsealed the documents for its planned initial public offering of stock and says it hopes to raise up to $1 billion in one of the year's most eagerly awaited stock market debuts.

CEO calls Zynga his 'crowning achievement'

Before Zynga traded its first share on Friday, nervous investors in the social-gaming company didn't know whether to expect a killing or to be killed.

Twitter set to make a splash on Wall Street

Wall Street is aflutter over Twitter, set to make the most anticipated stock market debut since Facebook in a huge test for social media and the technology sector.

Survey challenges popular beliefs about high-tech startup patents

(PhysOrg.com) -- A new survey of high-technology entrepreneurs finds that patents provide less incentive to innovate than popularly believed, but offer tangible benefits by limiting competition, attracting financing, and ...

Bazaarvoice, Proto Labs surge in market debuts

(AP) -- A splashy Wall Street debut by Bazaarvoice Inc. and Proto Labs Inc. is the latest sign that investor appetite for initial public offerings has rebounded after a dismal IPO market in 2011.

A look at recent tech sector IPOs

Here is a look at notable tech companies that have conducted initial public offerings over the past two years ahead of Twitter's IPO:

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