Latest Facebook 57 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.2.2; pl-pl; SM-G350 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 Galaxy Core Plus
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/57.0.0.18.136;] Android 4 A114
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; ZTE-Z998 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 Z998
Mozilla/5.0 (Linux; U; Android 4.1.2; es-mx; LG-P778 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 P778
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/57.0.0.18.136;] Android 4 Z740G
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; ZTE-Z740 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 Z740
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-D520 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 D520
Mozilla/5.0 (Linux; U; Android 4.1.2; en-au; LG-E435k Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 Optimus L3 II
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/57.0.0.18.136;] Android 4 Galaxy Discover
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-US730 Build/IMM76L) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 US730
Mozilla/5.0 (Linux; U; Android 4.0.4; en-ca; SGH-S730M Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 Galaxy Discover
Mozilla/5.0 (Linux; U; Android 4.0.3; en-gb; U9200 Build/HuaweiU9200C02B013) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 4 Ascend P1
Mozilla/5.0 (Linux; Android 7.0; AURII_DELIGHT Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/59.0.3071.125 Mobile Safari/537.36 [FBAN/InternetOrgApp;FBAV/57.0.0.6.236;] Android 7 Aurii Delight
Mozilla/5.0 (Linux; Android 5.1; LG-X210 Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/50.0.2661.86 Mobile Safari/537.36 [FBAN/InternetOrgApp;FBAV/57.0.0.6.236;] Android 5 K7
Mozilla/5.0 (Linux; Android 5.1; LG-H815 Build/LMY47D; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 5 G4
Mozilla/5.0 (Linux; Android 5.1.1; LG-H736 Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 5 G4s
Mozilla/5.0 (Linux; Android 5.0.2; SM-G901F Build/LRX22G; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 5 Galaxy S5 LTE+
Mozilla/5.0 (Linux; Android 5.0.2; SM-G530FZ Build/LRX22G; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 5 Galaxy Grand Prime
Mozilla/5.0 (Linux; Android 5.0.2; Redmi Note 2 Build/LRX22G) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/37.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/57.0.0.0.77;] Android 5 Redmi Note 2
Mozilla/5.0 (Linux; Android 5.0.2; LG-D610TR Build/LRX22G; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/57.0.0.18.136;] Android 5 G2 Mini