Latest Facebook 53 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 8.0; de-at; SM-G960UZKAACG Build/ROF41K;) AppleWebKit/526.26 (KHTML, like Gecko) Version/46 Mobile Safari/526.26 [FB_IAB/FB4A;FBAV/53.5.2.28.10;] Android 8 Galaxy S9
Mozilla/5.0 (Linux; U; Android 4.3; es-us; ZTE-Z669 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Z669
Mozilla/5.0 (Linux; U; Android 4.3; es-us; SM-G350M Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Core Plus
Mozilla/5.0 (Linux; U; Android 4.3; es-es; SM-G7105L Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Grand 2
Mozilla/5.0 (Linux; U; Android 4.2.2; es-us; GT-S7580E Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Trend Plus
Mozilla/5.0 (Linux; U; Android 4.2.2; es-es; SM-C105S Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy S4 zoom
Mozilla/5.0 (Linux; U; Android 4.2.2; es-es; GT-S7580E Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Trend Plus
Mozilla/5.0 (Linux; U; Android 4.2.2; es-es; GT-I9080E Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Grand
Mozilla/5.0 (Linux; U; Android 4.2.2; en-gb; GT-I9082C Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Grand Duos
Mozilla/5.0 (Linux; U; Android 4.2.1; en-in; Micromax A250 Build/JOP40D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 A250
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-br; LG-P655H Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Optimus F3
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-br; LG-E455f Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 E455f
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-br; LG-D683 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 G Pro Lite
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; ZTE-Z995 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Z995
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; GT-I8550E Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Win
Mozilla/5.0 (Linux; U; Android 4.1.2; es-us; GT-I8260E Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Core
Mozilla/5.0 (Linux; U; Android 4.1.2; ar-ae; HTC Desire 600 dual sim Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Desire 600 Dual SIM
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; SGH-S730G Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Discover
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; HTC One VX Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 One VX
Mozilla/5.0 (Linux; U; Android 4.0.4; en-au; GT-S7560M Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/FB4A;FBAV/53.0.0.29.18;] Android 4 Galaxy Trend