This appetite for personal data reflects a fundamental truth about Facebook and, by extension, the Internet economy as a whole: Facebook provides a free service that users pay for, in effect, by providing details about their lives, friendships, interests and activities. Facebook, in turn, uses that trove of information to attract advertisers, app makers and other business opportunities.

Up until a few years ago, such vast and easily accessible repositories of personal information were all but nonexistent. Their advent is driving a profound debate over the definition of privacy in an era when most people now carry information-transmitting devices with them all the time.

Capitalizing on personal data is a lucrative enterprise. Facebook is in the midst of planning for an initial public offering of its stock in May that could value the young company at more than $100 billion on the Nasdaq Stock Market.

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It’s not exactly a newsflash that one of the most important reasons to brush your teeth is to fight off cavities (not to mention prevent bad breath). But what if the way you brush your teeth actually makes you more susceptible to cavities, tooth decay and gum disease? Scary.

Turns out, there are a host of common mistakes that many of us make morning and night that can damage teeth and turn a healthy smile upside-down. Find out what you’re doing wrong — and how to break these bad habits for better teeth.

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There must be a few red faces knocking about the human resources department of UK-based Aviva Investors this week after it emerged it accidentally sent out an email giving all 1300 of its employees their marching orders.

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