New York - Online social network Facebook plans this week to announce a new tool that will allow companies to market to its users via their own branded pages, the Wall Street Journal reported on Monday.

The service will reportedly enable a retailer, for instance, to build a music or book recommendation service on Facebook, or allow media companies to create pages where users could share news articles.

Since launching in 2004, Facebook has amassed 23 million users, and is now adding 100,000 new users each day; the company is also already profitable, and expects to see revenues of nearly $150 million this year, sources to WSJ.

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