IBrowser / name / Facebook ​

Mozilla/5.0 (Linux; Android 5.0; SM-G900P Build/LRX21T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/43.0.2357.121 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/35.0.0.48.273;]

# Facebook in-App Browser for iOS with version
Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Mobile/14E304 [FBAN/FBIOS;FBAV/91.0.0.41.73;FBBV/57050710;FBDV/iPhone8,1;FBMD/iPhone;FBSN/iOS;FBSV/10.3.1;FBSS/2;FBCR/Telekom.de;FBID/phone;FBLC/de_DE;FBOP/5;FBRV/0])

# Facebook in-App Browser for iOS without version
Mozilla/5.0 (iPhone; CPU iPhone OS 13_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 [FBAN/FBIOS;FBDV/iPhone10,2;FBMD/iPhone;FBSN/iOS;FBSV/13.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBCR/]