The new messaging system will provide a '@facebook.com' e-mail address to users. The new system will integrates all web and text-based communications and works directly in the Facebook page.
Texts, email or instant messages will all come into one 'feed' or 'social inbox' and users can respond in any way they want. Users can respond to messages via an instant message or email.
The entire conversation histories will be stored in Inbox, which users can check at any time. Now Facebook users can connect with other people with e-mail or messaging other than the current system of posting messages on profile page and internal messaging service.
"This is not an email killer. This is a messaging system that includes email as one part of it," said Zuckerberg, Facebook CEO.
"Maybe we can help push the way people do messaging more towards this simple, real time, immediate personal experience. Email is still really important to a lot of people. We think this simple messaging is how people will shift their communication," he added.
"We really want to enable people to have conversations with the people they care about," Facebook's director of engineering Andrew Bosworth said.
The new service will be rolled out in coming months for Facebook's 500 million plus users with a @facebook.com address.
The new e-mail service will be a threat to internet giant Google's mail service Gmail and Yahoomail.