By Julia Boorstin, CNBC Correspondent NEW YORK ( CNBC) -- After a day of rumors and investigations, LinkedIn ( LNKD) has formally acknowledged that some of its users passwords have been "compromised." This is the worst privacy and security news to slam the business networking service yet. The company apologized and encouraged "best practices" to update passwords. This is no small deal: by some reports it impacted over six million passwords, about 4 percent of LinkedIn's users. But still, LinkedIn's stock has been remarkably robust. At one point Wednesday it sank about 1.2%, but it closed the day up 9 cents, and it's up nearly 50% year-to-date. On Wednesday not a single analyst issued a note in response to the news or changed a rating or stock target.
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