The fast growth of social-networking sites containing users' personal information is drawing concern from some payment data-security experts who say the risk of exposing consumers' sensitive data is rising. And mobile-payment devices pose similar risks because many developers lack data-security expertise, they say.

In many cases, consumers are putting their personal data at risk. Some 52% of social-networking site users within the past year have posted personal information to such sites as Facebook and MySpace, including their full birth dates or home addresses, according to survey data Consumer Reports released this month. Such data could increase users' risk of becoming victims of identity theft or other cybercrimes, the organization says.

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