Latest Facebook 268 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; ZTE Blade A3 Lite Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Blade A3 Lite
Mozilla/5.0 (Linux; Android 9; Z6201V Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Blade A7
Mozilla/5.0 (Linux; Android 9; W-P311-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 View 3
Mozilla/5.0 (Linux; Android 9; W-P311-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.162 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 View 3
Mozilla/5.0 (Linux; Android 9; vivo Z1i Build/PKQ1.180819.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Z1i
Mozilla/5.0 (Linux; Android 9; U304AA Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Radiant Core
Mozilla/5.0 (Linux; Android 9; U304AA Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/77.0.3865.92 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Radiant Core
Mozilla/5.0 (Linux; Android 9; TECNO LB8a Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Pouvoir 3 Plus
Mozilla/5.0 (Linux; Android 9; SM-S767VL Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy J7 Crown
Mozilla/5.0 (Linux; Android 9; SM-S367VL Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy J3 Orbit
Mozilla/5.0 (Linux; Android 9; SM-J530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy J5 (2017)
Mozilla/5.0 (Linux; Android 9; SM-J337U Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy J3 (2018)
Mozilla/5.0 (Linux; Android 9; SM-J337R4 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy J3 Aura
Mozilla/5.0 (Linux; Android 9; SM-J337P Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy J3 (2018)
Mozilla/5.0 (Linux; Android 9; SM-J337A Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy J3 (2018)
Mozilla/5.0 (Linux; Android 9; SM-G892U Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy S8 Active
Mozilla/5.0 (Linux; Android 9; SM-G892A Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy S8 Active
Mozilla/5.0 (Linux; Android 9; SM-A600P Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy A6
Mozilla/5.0 (Linux; Android 9; SM-A600A Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy A6
Mozilla/5.0 (Linux; Android 9; SM-A505U1 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/268.1.0.54.121;] Android 9 Galaxy A50