Latest Facebook 10 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 7.1.1; de-at; SAMSUNG SM-G960FZBABTU Build/NSB24K;) AppleWebKit/800.53 (KHTML, like Gecko) Version/47 Mobile Safari/800.53 [FB_IAB/FB4A;FBAV/10.5.1.44.94;] Android 7 Galaxy S9
Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_2 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Mobile/11D257 [FBAN/FBIOS;FBAV/10.0.0.26.21;FBBV/2441354;FBDV/iPhone3,3;FBMD/iPhone;FBSN/iPhone OS;FBSV/7.1.2;FBSS/2; FBCR/Verizon;FBID/phone;FBLC/en_US; iOS 7 iPhone 4
Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_6 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B500 [FBAN/FBIOS;FBAV/10.0.0.26.21;FBBV/2441354;FBDV/iPhone2,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/6.1.6;FBSS/1; FBCR/vodafoneUK;FBID/phone;FBLC/en_US iOS 6 iPhone 3GS
Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_6 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B500 [FBAN/FBIOS;FBAV/10.0.0.26.21;FBBV/2441354;FBDV/iPhone2,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/6.1.6;FBSS/1; FBCR/vodaAU;FBID/phone;FBLC/en_US;FBO iOS 6 iPhone 3GS
Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_6 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B500 [FBAN/FBIOS;FBAV/10.0.0.26.21;FBBV/2441354;FBDV/iPhone2,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/6.1.6;FBSS/1; FBCR/T-Mobile;FBID/phone;FBLC/en_US;F iOS 6 iPhone 3GS
Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_6 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B500 [FBAN/FBIOS;FBAV/10.0.0.26.21;FBBV/2441354;FBDV/iPhone2,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/6.1.6;FBSS/1; FBCR/Rogers;FBID/phone;FBLC/en_US;FBO iOS 6 iPhone 3GS
Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_3 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B329 [FBAN/FBIOS;FBAV/10.0.0.26.21;FBBV/2441354;FBDV/iPhone2,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/6.1.3;FBSS/1; FBCR/3DK;FBID/phone;FBLC/da_DK;FBOP/5 iOS 6 iPhone 3GS
Mozilla/5.0 (iPad; CPU OS 7_0_6 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Mobile/11B651 [FBAN/FBIOS;FBAV/10.0.0.26.21;FBBV/2441354;FBDV/iPad3,1;FBMD/iPad;FBSN/iPhone OS;FBSV/7.0.6;FBSS/2; FBCR/;FBID/tablet;FBLC/en_US;FBOP/1] iOS 7 iPad 3