Latest Facebook Messenger 97 user agents:

User Agent Platform Device
[FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.16.0;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-pt; GT-S6310N Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/MESSENGER;FBAV/97.0.0.13.71;] Android 4 Galaxy Young
Mozilla/5.0 (Linux; Android 7.0; SM-A310F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/97.0.0.13.71;] Android 7 Galaxy A3 (2016)
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.16.0;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.13.6;FBSS/1;FBID/desktop;FBLC/pt_PT;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.13.6;FBSS/1;FBID/desktop;FBLC/es_LA;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.12.6;FBSS/1;FBID/desktop;FBLC/pt_PT;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.16.0;FBSS/1;FBID/desktop;FBLC/en_GB;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.15.7;FBSS/1;FBID/desktop;FBLC/zh_HK;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.14.6;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.14.6;FBSS/1;FBID/desktop;FBLC/en_GB;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.14.5;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.13.6;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.14.6;FBSS/1;FBID/desktop;FBLC/fr_FR;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.14.6;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Messenger/97.11.116 Chrome/83.0.4103.122 Electron/9.1.0 Safari/537.36 MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.13.6;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac 10 Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.13.6;FBSS/1;FBID/desktop;FBLC/en_GB;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/mod_high;FBSN/darwin;FBSV/10.13.6;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.12.6;FBSS/1;FBID/desktop;FBLC/fr_FR;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Messenger/97.11.116 Chrome/83.0.4103.122 Electron/9.1.0 Safari/537.36 MessengerDesktop [FBAN/MessengerDesktop;FBAV/97.11.116;FBBV/283083801;FBDV/high;FBSN/darwin;FBSV/10.13.6;FBSS/1;FBID/desktop;FBLC/en_US;FBOP/0;FBWS/0;MDBeta/0;MDMas/0] Mac 10 Unknown