Latest Facebook Lite 52 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.3; en-us; ZTE-Z669 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30[FBAN/EMA;FBLC/en_US;FBAV/52.0.0.4.89;] Android 4 Z669
Mozilla/5.0 (Linux; U; Android 4.2.2; sr-rs; GT-S7582 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30[FBAN/EMA;FBLC/sr_RS;FBAV/52.0.0.4.89;] Android 4 Galaxy S DUOS 2
Mozilla/5.0 (Linux; Android 6.0; VFD 300 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.132 Mobile Safari/537.36[FBAN/EMA;FBLC/pt_PT;FBAV/52.0.0.4.89;] Android 6 Smart Mini 7
Mozilla/5.0 (Linux; Android 6.0; STARTRAIL 8 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/59.0.3071.125 Mobile Safari/537.36[FBAN/EMA;FBLC/pt_PT;FBAV/52.0.0.4.89;] Android 6 StarTrail 8
Mozilla/5.0 (Linux; Android 5.1; NOS FIVE Build/LMY47D; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/43.0.2357.121 Mobile Safari/537.36[FBAN/EMA;FBLC/pt_PT;FBAV/52.0.0.4.89;] Android 5 Five
Mozilla/5.0 (Linux; Android 5.1; HUAWEI CUN-L21 Build/HUAWEICUN-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/59.0.3071.125 Mobile Safari/537.36[FBAN/EMA;FBLC/pt_PT;FBAV/52.0.0.4.89;] Android 5 Y5II
Mozilla/5.0 (Linux; Android 4.4.2; Karbonn A19 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36[FBAN/EMA;FBLC/bg_BG;FBAV/52.0.0.4.89;] Android 4 A19