A list of all 56 of Facebook's gender options:
Agender: Someone who does not have an internal sense of gender.
Androgyne/Androgynous: A person in whom both feminine and masculine traits are integrated in his/her sense of gender.
Bigender: A gender which switches between what is traditionally considered "female" and "male" genders in society. Bigenders can switch between identifying with each gender, versus androgynes who combine both gender traits
Cis/Cisgender: Cis is a prefix to describe people whose gender identity and physical bodies match, for example, a female gender in a female body or a male gender in a male body.
Cis Female/Cis Woman/Cisgender Female/Cisgender Woman: A woman who identifies as a female gender in a female body and presents herself in feminine terms.
Cis Male/Cis Man/Cisgender Male/Cisgender Man: A man who identifies as a male gender in a male body and presents himself in masculine terms.
Female to Male/FTM/Trans Male/Trans Man/Transgender Male/Transsexual Male: Usually used to refer to the men who were born with female bodies but who transition to their real gender identity via social (i.e. living as a male) or medical (sex change operation) means.
Gender Fluid/Gender Variant: A person who may identify more as male one day and female another day, regardless of physical traits. Fluid is preferred to Variant as the latter implies there is a "normal" standard for gender.
Gender Nonconforming: A person who behaves and/or presents in ways society considers to be atypical for one's gender.
Gender Questioning: A person who is still in the process of discovering one's gender, sexual identity or sexual orientation.
Genderqueer/Neutrois/Non-binary: A person who identifies as neither man nor woman, is between or beyond genders, or a combination of genders.
Intersex: A person born with both male and female reproductive and sexual organs.
Male to Female/MTF/Trans Female/Trans Woman/Transgender Female/Transsexual Female: Usually used to refer to women who were born with male bodies but who transition to their real gender identity via social (i.e. living as a female) or medical (sex change operation) means.
Neither/Other: A person who does not identify as male or female.
Pangender: A person whose gender identity spans a range of gender expressions.
Trans/Trans Person/Transgender/Transgender Person: A prefix denoting crossing borders. Hence a trans person or transgender means a person whose gender identity is opposite to one's biological sex.
Transfeminine: Refers to a spectrum of gender identities dominated by female identity and femininity.
Transmasculine: Refers to a spectrum of gender identities dominated by male identity and masculinity.
Transsexual: An older term originating from medical and psychological communities referring to transgender.
Two-spirit: A Native American term referring to a person whose gender identity encompasses both genders.