Rapleaf, which compiles user profiles for targeted advertising, says it has stopped sharing Facebook and MySpace user identities with advertising networks due to privacy concerns.

"Facebook, MySpace and other online services employ user identifiers, which can appear as a number in the URL of a person's profile," writes Computerworld's Jeremy Kirk.

"The Wall Street Journal found that many popular Facebook applications such as Farmville were transmitting those user identifiers back to advertisers," Kirk writes.

Click here to read the Computerworld article.

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