Latest Facebook 166 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 8.1.0; TA-1053 Build/OPR1.170623.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 5
Mozilla/5.0 (Linux; Android 8.1.0; Pixel Build/OPM1.171019.021; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Pixel
Mozilla/5.0 (Linux; Android 8.0.0; VTR-L09 Build/HUAWEIVTR-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 P10
Mozilla/5.0 (Linux; Android 8.0.0; VKY-L09 Build/HUAWEIVKY-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 P10 Plus
Mozilla/5.0 (Linux; Android 8.0.0; SM-G950U1 Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Galaxy S8
Mozilla/5.0 (Linux; Android 8.0.0; SM-G950F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Galaxy S8
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A5010 Build/OPR1.170623.032; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 5T
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A5010 Build/OPR1.170623.032; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.63.95;] Android 8 5T
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A5000 Build/OPR1.170623.032; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 5
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A5000 Build/OPR1.170623.032; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.63.95;] Android 8 5
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A5000 Build/OPR1.170623.032; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.25.95;] Android 8 5
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A3010 Build/OPR6.170623.013; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 3T
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A3003 Build/OPR6.170623.013; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 3
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A3003 Build/OPR6.170623.013; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.63.95;] Android 8 3
Mozilla/5.0 (Linux; Android 8.0.0; moto x4 Build/OPW27.57-40; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Moto X4
Mozilla/5.0 (Linux; Android 8.0.0; Mi A1 Build/OPR1.170623.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Mi A1
Mozilla/5.0 (Linux; Android 8.0.0; MI 6 Build/OPR1.170623.027; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Mi 6
Mozilla/5.0 (Linux; Android 8.0.0; MI 6 Build/OPR1.170623.027; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.63.95;] Android 8 Mi 6
Mozilla/5.0 (Linux; Android 8.0.0; G8342 Build/47.1.A.12.145; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Xperia XZ1
Mozilla/5.0 (Linux; Android 8.0.0; G8341 Build/47.1.A.12.145; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/166.0.0.66.95;] Android 8 Xperia XZ1