Latest Facebook 91 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-br; LG-D956 Build/JDQ39B) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.2 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 G Flex
Mozilla/5.0 (Linux; U; Android 4.2.2; es-es; GT-S7580L Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 Galaxy Trend Plus
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-pt; GT-S7390 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 Galaxy Trend Lite
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; LG-LG870 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 870
Mozilla/5.0 (Linux; U; Android 4.1.2; es-mx; LG-E440g Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 Optimus L4 II
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/91.0.0.17.68;] Android 4 Z995
Mozilla/5.0 (Linux; U; Android 4.0.4; es-us; U9202L-3 Build/HuaweiU9202L) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 U9202L
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/91.0.0.17.68;] Android 4 Galaxy POCKET Plus
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; SGH-S730G Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 Galaxy Discover
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-MS770 Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 4 MS770
Mozilla/5.0 (Linux; Android 6.0; LG-D852G Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 6 G3
Mozilla/5.0 (Linux; Android 6.0.1; SM-N930T Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.2623.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 6 Galaxy Note 7
Mozilla/5.0 (Linux; Android 6.0.1; SM-N930R7 Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 6 Galaxy Note 7
Mozilla/5.0 (Linux; Android 6.0.1; SM-N930R4 Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 6 Galaxy Note 7
Mozilla/5.0 (Linux; Android 6.0.1; SM-N930R4 Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/91.0.0.15.68;] Android 6 Galaxy Note 7
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/91.0.0.17.68;] 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/91.0.0.17.68;] 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/91.0.0.17.68;] Android 5 Galaxy Grand Prime
Mozilla/5.0 (Linux; Android 5.1.1; Huawei G760 Build/LMY48W) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/39.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 5 G760
Mozilla/5.0 (Linux; Android 5.0; SELFIX_SLASH6 Build/LRX21M) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/37.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/91.0.0.17.68;] Android 5 Slash 6