Facebook is expected to launch a new messaging system seen as a challenge to Google's Gmail, Yahoo and Hotmail.The giant social network - which boasts more than 500 million users worldwide - will host a special event in San Francisco on Monday.
Unconfirmed reports suggest Facebook could announce its own e-mail address - @facebook.com - or even a fully-fledged web-based e-mail system.
Google-Facebook rivalry has increased recently amid a series of disputes.
Google has banned Facebook from importing its users' e-mail contacts, a move it says it made because Facebook refused to allow the export of contact and friend data from within user profiles.
In reply, Facebook enabled a workaround that let users save their Google contacts to their computers before importing them into Facebook.
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