Privacy has long been a sensitive issue for Facebook. The word was mentioned 35 times in its filing to the U.S. Securities and Exchange Commission on Wednesday to sell company stock on the public market.

Facebook lists users' concerns over privacy as a risk to its business because it could prompt them to curb their usage of the social network. Perhaps more surprising, Facebook also says in the prospectus that as more people access the service from an application on their phones or tablets, the company could face problems.

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