Latest Facebook 31 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.3; en-us; ZTE-Z669 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.18.13;] Android 4 Z669
Mozilla/5.0 (Linux; U; Android 4.3; en-us; MT2L03 Build/HuaweiMT2L03LITE) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 Ascend Mate 2
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/31.0.0.12.13;] Android 4 H871G
Mozilla/5.0 (Linux; U; Android 4.3; en-us; H30-C00 Build/HuaweiH30-C00) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.0.6;] Android 4 Honor 3C
Mozilla/5.0 (Linux; U; Android 4.2.2; es-us; GT-S7582L Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 Galaxy S DUOS 2
Mozilla/5.0 (Linux; U; Android 4.2.2; en-us; Micromax A69 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 A69
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; ZTE-Z740G Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 Z740G
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; GT-B5330L Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 Galaxy Chat
Mozilla/5.0 (Linux; U; Android 4.1.2; es-mx; LG-P659 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 P659
Mozilla/5.0 (Linux; U; Android 4.1.2; es-cl; LG-P714 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 Optimus L7 II
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; ZTE-Z998 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.19.13;] Android 4 Z998
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/31.0.0.20.13;] 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/31.0.0.0.7;] Android 4 Z740
Mozilla/5.0 (Linux; U; Android 4.1.2; en-gb; LG-E435k Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 Optimus L3 II
Mozilla/5.0 (Linux; U; Android 4.1.2; en-au; GT-I9100T Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.19.13;] Android 4 Galaxy S II
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/31.0.0.19.13;] Android 4 Avail 2
Mozilla/5.0 (Linux; U; Android 4.1.1; en-us; Prism II Build/HuaweiU8686) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 U8686
Mozilla/5.0 (Linux; U; Android 4.0.4; pt-br; GT-S5301B Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 Galaxy POCKET Plus
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-P935 Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.20.13;] Android 4 P935
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; LG-LS860 Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/31.0.0.19.13;] Android 4 LS860