Latest Facebook Lite 31 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-pt; GT-S7582 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30[FBAN/EMA;FBLC/pt_PT;FBAV/31.0.0.2.69;] Android 4 Galaxy S DUOS 2
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-pt; GT-P3110 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Safari/534.30[FBAN/EMA;FBLC/pt_PT;FBAV/31.0.0.2.69;] Android 4 Galaxy Tab 2 7" WiFi
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-br; GT-I8552B Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30[FBAN/EMA;FBLC/pt_BR;FBAV/31.0.0.2.69;] Android 4 Galaxy Win