Latest Facebook Groups 24 user agents:

User Agent Platform Device
Mozilla/5.0 (iPod touch; CPU iPhone OS 9_0_2 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13A452 [FBAN/GroupsForiOS;FBAV/24.0;FBBV/15678229;FBDV/iPod5,1;FBMD/iPod touch;FBSN/iPhone OS;FBSV/9.0.2;FBSS/2; FBCR/;FBID/phone;FBLC/en_US;F iOS 9 iPod Touch 5
Mozilla/5.0 (iPad; CPU iPhone OS 10_3_2like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13A452 [FBAN/GroupsForiOS;FBAV/24.0;FBBV/15678229;FBDV/iPad;FBMD/tablet;FBSN/iPhone OS;FBSV/9.0.2;FBSS/2; FBCR/;FBID/phone;FBLC/vi_VN;F iOS 10 iPad