Translation guide
Facebook is a social media platform. In Japanese, it is usually referred to by its English name, written in katakana.
Referring to the Facebook website or app
The standard Japanese name for Facebook. Used in all contexts.
I keep in touch with friends on Facebook.
An abbreviation sometimes used in casual online communication, similar to English.
I sent you an event invite on FB.
フェイスブックのアカウントを持っていますか？
Do you have a Facebook account?