Latest Facebook 45 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 8.0.0; de-at; SM-G960UZBAUSC Build/RCX63X;) AppleWebKit/115.87 (KHTML, like Gecko) Version/42 Mobile Safari/115.87 [FB_IAB/FB4A;FBAV/45.1.3.34.09;] Android 8 Galaxy S9
Mozilla/5.0 (Linux; U; Android 4.2.1; en-us; HUAWEI G700-U00 Build/HuaweiG700-U00) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 4 Ascend G700
Mozilla/5.0 (Linux; U; Android 4.2.1; en-in; Micromax A210 Build/JOP40D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 4 A210
Mozilla/5.0 (Linux; U; Android 4.1.2; pl-pl; GT-I8190N Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 4 Galaxy S III mini
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; ZTE-Z740G Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/45.0.0.36.146;] Android 4 Z740G
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; ZTE-Z740G Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/45.0.0.0.106;] Android 4 Z740G
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/45.0.0.38.146;] Android 4 Z740
Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-P870 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 4 P870
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; HUAWEI-M931 Build/HuaweiM931) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 4 M931
Mozilla/5.0 (Linux; Android 5.1; NOS NOVU II Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Novu II
Mozilla/5.0 (Linux; Android 5.1; NOS NOVU II Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Novu II
Mozilla/5.0 (Linux; Android 5.1; NOS NOVU II Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Novu II
Mozilla/5.0 (Linux; Android 5.1; NOS NOVU II Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Novu II
Mozilla/5.0 (Linux; Android 5.1; NOS NOVU II Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/60.0.3112.116 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Novu II
Mozilla/5.0 (Linux; Android 5.1; NOS NOVU II Build/LMY47I; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Novu II
Mozilla/5.0 (Linux; Android 5.1.1; ZTE Blade S6 Flex Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Blade S6
Mozilla/5.0 (Linux; Android 5.0.2; HTC One Build/LRX22G; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 One
Mozilla/5.0 (Linux; Android 5.0.1; SM-N910V Build/LRX22C; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.38.146;] Android 5 Galaxy Note 4
Mozilla/5.0 (Linux; Android 4.4.2; HTC_0P4E2 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/45.0.0.36.146;] Android 4 Desire 601
Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13B143 [FBAN/FBIOS;FBAV/45.0.0.45.96;FBBV/18289579;FBDV/iPhone6,2;FBMD/iPhone;FBSN/iPhone OS;FBSV/9.1;FBSS/2; FBCR/Vodafone.de;FBID/phone;FBLC/de_DE iOS 9 iPhone 5S