Blackberry said it is “extremely disappointed” with Facebook’s decision to discontinue support for its app.
It means Blackberry users will have to use the mobile version of the website to log on to the social network.
It is not clear when this will come into effect.
Earlier this month WhatsApp, which is owned by Facebook, also announced that it would only continue to support Blackberry’s Android-powered Priv handset.
Whatsapp support for Blackberry’s own operating system will end at the end of 2016