Latest Facebook 171 user agents:

User Agent Platform Device
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/65.0.3325.109 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 6
Mozilla/5.0 (Linux; Android 8.1.0; Symbol X Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/117.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 Symbol X
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/171.0.0.49.92;] 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/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.8.92;] Android 8 5
Mozilla/5.0 (Linux; Android 8.1.0; EML-L29 Build/HUAWEIEML-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] 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/171.0.0.49.92;] Android 8 Aquaris X Pro
Mozilla/5.0 (Linux; Android 8.0.0; XT1635-02 Build/OPN27.76-12-22; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 Moto Z Play
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/171.0.0.49.92;] Android 8 P10
Mozilla/5.0 (Linux; Android 8.0.0; U_Pro Build/Elephone_U_Pro_20180227; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 U Pro
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/171.0.0.49.92;] Android 8 5
Mozilla/5.0 (Linux; Android 8.0.0; SM-G935F 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/171.0.0.49.92;] Android 8 Galaxy S7 Edge
Mozilla/5.0 (Linux; Android 8.0.0; HTC U Ultra Build/OPR1.170623.032; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 U Ultra
Mozilla/5.0 (Linux; Android 8.0.0; G3412 Build/48.1.A.0.138; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.22.92;] Android 8 Xperia XA1 Plus
Mozilla/5.0 (Linux; Android 8.0.0; G3221 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/171.0.0.49.92;] Android 8 Xperia XA1 Ultra
Mozilla/5.0 (Linux; Android 8.0.0; F8131 Build/41.3.A.2.107; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 Xperia X Performance
Mozilla/5.0 (Linux; Android 8.0.0; F5121 Build/34.4.A.2.32; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 Xperia X
Mozilla/5.0 (Linux; Android 8.0.0; ASUS_Z01KD Build/OPR6.170623.013; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 ZenFone 4
Mozilla/5.0 (Linux; Android 8.0.0; ASUS_Z017D 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/171.0.0.41.92;] Android 8 ZenFone 3
Mozilla/5.0 (Linux; Android 8.0.0; 5099D Build/O00623; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 8 3V
Mozilla/5.0 (Linux; Android 7.1.2; Z2 Plus Build/N2G47E; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/171.0.0.49.92;] Android 7 Z2 Plus