Latest Facebook 55 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.3; es-us; SM-G350L Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 Galaxy Core Plus
Mozilla/5.0 (Linux; U; Android 4.3; en-us; SCH-R530X Build/JSS15J) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.4.66;] Android 4 Galaxy S III LTE
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-br; GT-S7582L Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.4.66;] Android 4 Galaxy S DUOS 2
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/55.0.0.18.66;] Android 4 Galaxy Core Plus
Mozilla/5.0 (Linux; U; Android 4.2.2; pl-pl; GT-S7580 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 Galaxy Trend Plus
Mozilla/5.0 (Linux; U; Android 4.2.2; en-us; SM-C105S Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 Galaxy S4 zoom
Mozilla/5.0 (Linux; U; Android 4.2.2; en-us; GT-I9063T Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.17.66;] Android 4 Galaxy Grand Neo Duos
Mozilla/5.0 (Linux; U; Android 4.1.2; zh-tw; HTC_7060 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 7060
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-br; LG-P655H Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 Optimus F3
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-br; LG-E467f Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 Optimus L4 II Dual
Mozilla/5.0 (Linux; U; Android 4.1.2; es-cl; LG-E425j Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 E425j
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/55.0.0.18.66;] 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/55.0.0.18.66;] Android 4 Z995
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; Xperia Play Build/JZO54K; CyanogenMod-10) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] CyanogenMod 10 Xperia P
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; SCH-R530U Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 Galaxy S III LTE
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-LS970 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 Optimus G
Mozilla/5.0 (Linux; U; Android 4.1.2; en-gb; HUAWEI D2 Build/HuaweiD2) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 D2
Mozilla/5.0 (Linux; U; Android 4.1.2; en-cn; HTC 606w Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 606w
Mozilla/5.0 (Linux; U; Android 4.1.2; en-ca; LG-E971 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/55.0.0.18.66;] Android 4 E971
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/55.0.0.18.66;] Android 4 Avail 2