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The American dream of children growing up to earn more than their parents is harder to achieve than it used to be, and big data gives valuable insight into how it has changed.

The American dream of children growing up to earn more than their parents is harder to achieve than it used to be, and big data gives valuable insight into how it has changed.

Facebook prohibits paid tobacco advertising, but Stanford researchers found brands and vendors marketing their products through unpaid content, in apparent conflict with the rules or their spirit.

Facebook prohibits paid tobacco advertising, but Stanford researchers found brands and vendors marketing their products through unpaid content, in apparent conflict with the rules or their spirit.