Latest Facebook 83 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.3; en-us; HUAWEI H871G Build/HuaweiH871G) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 H871G
Mozilla/5.0 (Linux; U; Android 4.3; en-us; HUAWEI C8816 Build/HuaweiC8816) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 C8816
Mozilla/5.0 (Linux; U; Android 4.2.2; es-es; SM-C105L Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Galaxy S4 zoom
Mozilla/5.0 (Linux; U; Android 4.2.2; en-us; Micromax A47 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 A47
Mozilla/5.0 (Linux; U; Android 4.2.2; en-in; Micromax A114 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 A114
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; GT-S6810L Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Galaxy FAME
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; ZTE-Z995 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Z995
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; ZTE-Z740G Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Z740G
Mozilla/5.0 (Linux; U; Android 4.0.4; es-us; GT-S5301L Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Galaxy POCKET Plus
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-P870 Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 P870
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-MS870 Build/IMM76L) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Sprint 4G
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; HUAWEI M881 Build/HuaweiM881) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 M881
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; HTC One VX Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 One VX
Mozilla/5.0 (Linux; U; Android 4.0.3; ru-ru; U9500 Build/HuaweiU9500) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Ascend D1
Mozilla/5.0 (Linux; U; Android 4.0.3; en-ca; LG-P880g Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 4 Optimus 4X HD
Mozilla/5.0 (Linux; Android 5.1; VF-696 Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/43.0.2357.121 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 5 Smart Grand 6
Mozilla/5.0 (Linux; Android 5.1; SELFIX_Q5_URBAN Build/LMY47I) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/39.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 5 Q5 Urban
Mozilla/5.0 (Linux; Android 5.1; SELFIX_Q3_REBEL Build/LMY47I) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/39.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 5 Q3 Rebel
Mozilla/5.0 (Linux; Android 5.1.1; SM-G531F Build/LMY48B; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/51.0.2704.81 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 5 Galaxy Grand Prime
Mozilla/5.0 (Linux; Android 5.1.1; LG-H740 Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/43.0.2357.121 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/83.0.0.20.71;] Android 5 G Vista 2