An algorithm to figure out your gender

Twitter claims a 90 percent accuracy rate for the clever techniques it uses to learn the gender of any given user. Glenn Fleishman reports on the company's disconcerting new analytics tools, the research behind them, and how large a pinch of salt they come with.

Popular social networking service begins offering stock for public trading

Facebook Inc. CEO Mark Zuckerberg is seen on a screen televised from their headquarters in Menlo Park moments after their IPO launch in New York. (REUTERS)

Shares of Facebook (FB) opened at $42.05 on today, up about 11 percent from the IPO price of $38. At this valuation, the company is worth around $115 billion. But shortly after the open, despite all the bubblicious hype leading up to FB's debut: share price dropped. At the time of this blog post, the price is hovering around $38.

The WSJ reports that trading volume was more than 375 million in first three hours of listing, more than 6.5% of total market volume. Trade volume is expected to set a new record in trading volume on IPO day.

STOCKENFREUDE (n): That feeling you get, as someone who loathes Facebook, seeing FB shares crap out on IPO day.

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