Latest Facebook 121 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.4.2; de-de; HTC 0PL4100 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 4 0PL4100
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/121.0.0.20.69;] Android 4 Galaxy S III LTE
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-pt; ALCATEL ONE TOUCH 7041X Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.2 Mobile Safari/534.30 SVN/070FPG1 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 4 One Touch Pop C7
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-br; GT-I9063T Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 4 Galaxy Grand Neo Duos
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/121.0.0.20.69;] Android 4 Galaxy Stellar
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/121.0.0.20.69;] Android 4 Optimus G Pro
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-AS780 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 4 AS780
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; Huawei Y301A2 Build/HuaweiY301A2) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 4 Y301A2
Mozilla/5.0 (Linux; U; Android 4.0.4; en-ca; LG-P935 Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 4 P935
Mozilla/5.0 (Linux; Android 7.0; Monaco Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 7 Monaco
Mozilla/5.0 (Linux; Android 7.0; Monaco Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 7 Monaco
Mozilla/5.0 (Linux; Android 7.0; Monaco Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.111 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 7 Monaco
Mozilla/5.0 (Linux; Android 7.0; Monaco Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 7 Monaco
Mozilla/5.0 (Linux; Android 7.0; Konnect_504 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/56.0.2924.87 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 7 Konnect 504
Mozilla/5.0 (Linux; Android 6.0; XT1069 Build/MPB24.65-34-3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.132 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 6 Moto G
Mozilla/5.0 (Linux; Android 6.0; ROBBY Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/56.0.2924.87 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 6 Robby
Mozilla/5.0 (Linux; Android 6.0; MotoG3 Build/MPIS24.65-33.1-2-16; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 6 Moto G3
Mozilla/5.0 (Linux; Android 6.0; LENNY3 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 6 Lenny 3
Mozilla/5.0 (Linux; Android 6.0.1; VFD 600 Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.132 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 6 Smart Prime 7
Mozilla/5.0 (Linux; Android 6.0.1; HTC D820t Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/121.0.0.20.69;] Android 6 D820t