Latest Facebook Messenger 181 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-pt; TR10CS2 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Safari/534.30 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 4 TR10CS2
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-pt; GT-I9505 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 4 Galaxy S4
Mozilla/5.0 (Linux; Android 8.1.0; Z2 Plus Build/OPM2.171019.029; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.106 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Z2 Plus
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/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] 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/69.0.3497.86 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 5
Mozilla/5.0 (Linux; Android 8.1.0; Mi A2 Build/OPM1.171019.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Mi A2
Mozilla/5.0 (Linux; Android 8.1.0; EML-L29 Build/HUAWEIEML-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] 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/69.0.3497.76 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 P20
Mozilla/5.0 (Linux; Android 8.1.0; CLT-L29 Build/HUAWEICLT-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 P20 Pro
Mozilla/5.0 (Linux; Android 8.1.0; CAG-L03 Build/HUAWEICAG-L03; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Y5 Lite (2018)
Mozilla/5.0 (Linux; Android 8.0.0; WAS-LX1A Build/HUAWEIWAS-LX1A; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 P10 Lite
Mozilla/5.0 (Linux; Android 8.0.0; STF-L09 Build/HUAWEISTF-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Honor 9
Mozilla/5.0 (Linux; Android 8.0.0; SM-J600FN Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Galaxy J6
Mozilla/5.0 (Linux; Android 8.0.0; SM-G950F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.86 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] 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/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Galaxy S8
Mozilla/5.0 (Linux; Android 8.0.0; SM-G930F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Galaxy S7
Mozilla/5.0 (Linux; Android 8.0.0; RNE-L01 Build/HUAWEIRNE-L01; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Mate 10 Lite
Mozilla/5.0 (Linux; Android 8.0.0; FIG-LX1 Build/HUAWEIFIG-LX1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 P smart
Mozilla/5.0 (Linux; Android 8.0.0; BLA-L29 Build/HUAWEIBLA-L29S; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Mate 10 Pro
Mozilla/5.0 (Linux; Android 8.0.0; ATU-L21 Build/HUAWEIATU-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/181.0.0.12.78;] Android 8 Y6 (2018)