Facebook CEO Mark Zuckerberg has explained why the company was forced to spin its Messenger service off into a separate mobile app.

The entrepreneur said his team would have been unable to provide quality of service if the chat programme continued to exist as a tab inside the main Facebook app.

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"Even though it was a short-term, painful thing to ask folks to install a separate messaging app, we knew that we could never deliver the quality of experience as just a tab inside the main Facebook app," he said during a public Q&A.

Zuckerberg went on to say that the decision to force a separate app on users who wish to send direct messages via their mobile phones was made for the good of the entire community.

"We're trying to build a service that's good for everyone. Because Messenger is faster and more focused, if you're using it, you respond to messages faster," he added.

Facebook Messenger has attracted its fair share of negative reviews on Google Play and the Apple App Store from users who are unhappy that it was practically forced upon them, but it holds an overall rating of four stars on the Android storefront.