Latest Facebook 28 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 7.0; de-at; SM-G960UZPAATT Build/NSH92Y;) AppleWebKit/817.77 (KHTML, like Gecko) Version/49 Mobile Safari/817.77 [FB_IAB/FB4A;FBAV/28.4.6.93.22;] Android 7 Galaxy S9
Mozilla/5.0 (Linux; U; Android 4.3; es-us; SM-G350M Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Galaxy Core Plus
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/28.0.0.20.16;] Android 4 Z669
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/28.0.0.20.16;] Android 4 Z667G
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/28.0.0.20.16;] Android 4 Ascend Mate 2
Mozilla/5.0 (Linux; U; Android 4.3; en-us; HUAWEI C8817L Build/HuaweiC8817L) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.0.15;] Android 4 C8817L
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/28.0.0.20.16;] Android 4 A114
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-pt; LG-E445 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Optimus L4 II Dual
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; ZTE-Z995 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Z995
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/28.0.0.20.16;] Android 4 Galaxy Chat
Mozilla/5.0 (Linux; U; Android 4.1.2; es-mx; LG-E450f Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Optimus L5 II
Mozilla/5.0 (Linux; U; Android 4.1.2; es-ar; LG-E987 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Optimus G
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/28.0.0.20.16;] Android 4 Z998
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; VS930 4G Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Spectrum II 4G
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; SCH-R740C Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Galaxy Discover
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-E970 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 E970
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; HUAWEI C8815 Build/HuaweiC8815) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 C8815
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; GT-S7710L Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Galaxy Xcover 2
Mozilla/5.0 (Linux; U; Android 4.1.2; en-ca; LG-E450B Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Optimus L5 II
Mozilla/5.0 (Linux; U; Android 4.1.2; en-au; GT-S5310T Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/28.0.0.20.16;] Android 4 Galaxy POCKET Neo