Latest Facebook 174 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 8.1.0; W_K400 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Lenny 5
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/67.0.3396.68 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 5
Mozilla/5.0 (Linux; Android 8.1.0; TA-1021 Build/OPR1.170623.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 6
Mozilla/5.0 (Linux; Android 8.1.0; ONEPLUS A5000 Build/OPM1.171019.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 5
Mozilla/5.0 (Linux; Android 8.1.0; ONEPLUS A5000 Build/OPM1.171019.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.31.96;] Android 8 5
Mozilla/5.0 (Linux; Android 8.1.0; Nokia 1 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 1
Mozilla/5.0 (Linux; Android 8.1.0; EML-L29 Build/HUAWEIEML-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 P20
Mozilla/5.0 (Linux; Android 8.1.0; EML-L29 Build/HUAWEIEML-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.52.96;] Android 8 P20
Mozilla/5.0 (Linux; Android 8.1.0; EML-L09 Build/HUAWEIEML-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.68 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 P20
Mozilla/5.0 (Linux; Android 8.1.0; Aquaris X Pro Build/OPM1.171019.019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Aquaris X Pro
Mozilla/5.0 (Linux; Android 8.1.0; Aquaris X Build/OPM1.171019.019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Aquaris X
Mozilla/5.0 (Linux; Android 8.0.0; TA-1053 Build/OPR1.170623.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 5
Mozilla/5.0 (Linux; Android 8.0.0; SM-N950F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.81 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Galaxy Note 8
Mozilla/5.0 (Linux; Android 8.0.0; SM-G960F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Galaxy S9
Mozilla/5.0 (Linux; Android 8.0.0; SM-A520F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.52.96;] Android 8 Galaxy A5 (2017)
Mozilla/5.0 (Linux; Android 8.0.0; SM-A520F 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/174.0.0.54.96;] Android 8 Galaxy A5 (2017)
Mozilla/5.0 (Linux; Android 8.0.0; SM-A320FL Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.68 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Galaxy A3 (2017)
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/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Mi A1
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/64.0.3282.137 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Mi A1
Mozilla/5.0 (Linux; Android 8.0.0; G3121 Build/48.1.A.0.129; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/174.0.0.54.96;] Android 8 Xperia XA1