Latest Facebook 68 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.3; en-us; ZTE-Z777 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 Z777
Mozilla/5.0 (Linux; U; Android 4.3; en-us; ZTE-Z667G Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 Z667G
Mozilla/5.0 (Linux; U; Android 4.2.2; es-; LG-D951 Build/JDQ39B) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.2 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 G Flex
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/68.0.0.37.59;] Android 4 A47
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/68.0.0.37.59;] Android 4 Z995
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/68.0.0.37.59;] Android 4 Z740
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; SCH-I200 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 Galaxy Stellar
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/68.0.0.37.59;] 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/68.0.0.37.59;] Android 4 US730
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-LS840 Build/ZVI.IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 Viper 4G LTE
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; Huawei-U8687 Build/HuaweiU8687) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 U8687
Mozilla/5.0 (Linux; U; Android 4.0.3; en-ca; HTC-X710a Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 X710a
Mozilla/5.0 (Linux; Android 5.1.1; SM-G920R6 Build/LMY47X; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/48.0.2564.106 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 5 Galaxy S6
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/68.0.0.37.59;] Android 5 Slash 6
Mozilla/5.0 (Linux; Android 4.4.2; LG-F370L Build/KOT49I.F370L10r) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 F70
Mozilla/5.0 (Linux; Android 4.4.2; LG-D802 Build/KOT49I.D80220a) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 G2
Mozilla/5.0 (Linux; Android 4.4.2; HTC_PO582 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/68.0.0.37.59;] Android 4 One mini
Mozilla/5.0 (iPhone; CPU iPhone OS 9_3_5 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13G36 [FBAN/FBIOS;FBAV/68.0.0.49.70;FBBV/41924288;FBRV/0;FBDV/iPhone4,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/9.3.5;FBSS/2;FBCR/TIGO;FBID/phone;FBLC/es_ iOS 9 iPhone 4S
Mozilla/5.0 (iPhone; CPU iPhone OS 9_3_5 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13G36 [FBAN/FBIOS;FBAV/68.0.0.49.70;FBBV/41924288;FBRV/0;FBDV/iPhone4,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/9.3.5;FBSS/2;FBCR/Rogers;FBID/phone;FBLC/e iOS 9 iPhone 4S
Mozilla/5.0 (iPad; CPU OS 9_3_5 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13G36 [FBAN/FBIOS;FBAV/68.0.0.49.70;FBBV/41924288;FBRV/0;FBDV/iPad3,1;FBMD/iPad;FBSN/iPhone OS;FBSV/9.3.5;FBSS/2;FBCR/;FBID/tablet;FBLC/en_US;FBOP/5] iOS 9 iPad 3