It will Only be Visible in Facebook Application. It can be Used in Status, Comment & Message. You can Replace "fg" to "bg" from Code to Change Background Colour. To Know How to Write, See Example in Last.
<fg=b0ffd700> = Golden
<fg=b0000000> = Black
<fg=b0ff7f00> = Orange
<fg=b0ffff00> = Yellow
<fg=b0ff00ff> = Light Pink
<fg=b0ff00ff> = Dark Pink
<fg=b0800000> = Brown
<fg=b0ffc0cb> = Light Purple
<fg=b06f00ff> = Dark Blue
<fg=80ffffff> = Sky Blue
<fg=b000ffff> = Light Blue
<fg=b0bf00ff> = Purple
<fg=b08f00ff> = Dark Purple
<fg=b0808000> = Mehandi Green
<fg=b00000ff> = Blue
<fg=f0f00f0f> = Red
<fg=b000ff00> = Green


Example:
For Red Text, Write as Shown.
<fg=f0f00f0f> GeekyTricks

Result:
GeekyTricks
https://www.facebook.com/syedaftab946954