Latest Facebook 42 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.3; es-us; ZTE-Z669 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Z669
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/42.0.0.24.114;] 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/42.0.0.27.114;] Android 4 Z667G
Mozilla/5.0 (Linux; U; Android 4.3; en-us; SAMSUNG-SM-N900A Build/JSS15J) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Galaxy Note 3
Mozilla/5.0 (Linux; U; Android 4.2.2; en-us; vivo Y17W Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Y17W
Mozilla/5.0 (Linux; U; Android 4.2.2; en-us; HTC0P4E1 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Desire 601
Mozilla/5.0 (Linux; U; Android 4.1.2; es-ar; LG-P712 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Optimus L7 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/42.0.0.27.114;] 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/42.0.0.24.114;] Android 4 Z740
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-F240 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 F240
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-E980h Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Optimus G Pro
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-E425g Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 E425g
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; HTC Holiday Build/JZO54K; CyanogenMod-10.0.0) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] CyanogenMod 10 Holiday
Mozilla/5.0 (Linux; U; Android 4.1.2; en-au; LG-P713GO Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 P713GO
Mozilla/5.0 (Linux; U; Android 4.1.2; en-au; HTC_0P6A1 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 0P6A1
Mozilla/5.0 (Linux; U; Android 4.1.2; en-au; GT-N7000B Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Galaxy Note
Mozilla/5.0 (Linux; U; Android 4.1.1; en-us; ZTE-Z993 Build/JRO03C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Z993
Mozilla/5.0 (Linux; U; Android 4.1.1; en-us; ZTE-Z992 Build/JRO03C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 Avail 2
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-AS730 Build/IMM76L) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 4 AS730
Mozilla/5.0 (Linux; Android 5.0.2; ZTE Blade L3 Build/LRX22G; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/64.0.3282.137 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/42.0.0.27.114;] Android 5 Blade L3