MarketWatch - Friday, April 18, 2014

By CBS News

Published 04/18 2014 06:23AM

Updated 04/18 2014 06:24AM

CBSNews -- Investigators are closer to figuring out who hacked Target last year and a new study on weight gain on the job.

The markets are closed today for the Good Friday holiday.

The Dow fell 16 points and the NASDAQ was up nine.

A Chinese social media company made its U.S. market debut Thursday.

Weibo joined the NASDAQ and surged 19 percent from its initial pricing.

The service, similar to Twitter, allows users to post up to 140 Chinese characters. It has more than 61 million daily active users.

The Secret Service says it's closer to figuring out how hackers breached Target's computer system last winter.

As many as 70 million people may have been affected by the pre-Christmas breach, but the agency says actually prosecuting the crooks could take years since they likely operated from overseas.

More than half of workers call themselves overweight, according to a new career builder survey.

46 percent of women said they've gained weight at their job, compared to about a third of men. Men were also more likely to get regular exercise.

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