Handling for FB app UA strings

[jacobpierce]

(null) [fban/fbios;fbav/61.0.0.53.158;fbbv/35251526;fbrv/0;fbdv/ipad4,1;fbmd/ipad;fbsn/iphone os;fbsv/9.3.2;fbss/2;fbcr/;fbid/tablet;fblc/en_us;fbop/5]

facebook app

The four-letter codes beginning with FB appear to be named properties:
[
FBAN/FBIOS;
FBAV/20.1.0.15.10;
FBBV/5758778;
FBDV/iPhone6,2;
FBMD/iPhone;
FBSN/iPhone OS;
FBSV/8.1.2;
FBSS/2;
FBCR/TELEGRL;
FBID/phone;
FBLC/da_DK;
FBOP/5
]

My guesses about what the property names mean:
FBAN: FaceBook Application Name
FBAV: FaceBook Application Version
FBBV: FaceBook Build Version
FBDV: FaceBook Device Version
FBMD: FaceBook Major Device
FBSN: FaceBook System Name
FBSV: FaceBook System Version
FBSS: FaceBook System Something :)
FBCR: FaceBook CarrieR
FBID: FaceBook Identity of Device
FBLC: FaceBook Language Code
FBOP: FaceBook Other Parameters? I've no idea - looks like it might be a decimalised bit mask

Possible values I've seen in some of the fields (those in parens are regex patterns):

FBAN: (FBIOS|FB4A|MessengerForiOS)
FBAV: { many, many... }
FBBV: { many, many... }
FBDV: (iPhone|iPad)[0-9],[0-9]
FBMD: (iPhone|iPad)
FBSN: (iPhone OS)
FBSV: { matches the OS version earlier in the useragent string }
FBSS: ([1-3])
FBCR: { Sprint, Verizon, , AT&T, Three, vodaAU, 3Austria, Telstra, TELIA, OPTUS, U.S.Cellular, TFW, OrangeFrance }
FBID: (phone|tablet)
FBLC: { any language code of the form en_US - I've seen many }
FBOP: (1|5)