The messaging website gives a way to FB users to just concentrate on messaging.
Facebook has no plans to remove messaging from its core Web service, a spokesperson confirmed.
Facebook has been releasing a spurt of apps and features this year.
Messenger.com will support a lot of these features as well, including payments.
Also you also dont need the Messenger mobile app to use Messenger.com.
Messenger will be available to English-speaking users worldwide and will be available in other languages in the coming weeks.
source: www.techworm.net