There are 2 definitions of FB in English:

FB

Line breaks: FB

abbreviation

Facebook: I’ve made contact with her on FB and we are e-mailing I came across their FB page, and two clicks later I’d joined up

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Definition of FB in:

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Word of the day grammarian
Pronunciation: grəˈme(ə)rēən
noun
a person who studies and writes about grammar

There are 2 definitions of FB in English:

fb

Syllabification: fb

Entry from US English dictionary

(also f.b.)

abbreviation

Sports Fullback.

More definitions of FB

Definition of fb in:

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Word of the day grammarian
Pronunciation: grəˈme(ə)rēən
noun
a person who studies and writes about grammar