Latest Facebook 7 user agents:

User Agent Platform Device
Mozilla/5.0 (iPod; CPU iPhone OS 6_1_6 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B500 [FBAN/FBIOS;FBAV/7.0.0.17.1;FBBV/1325030;FBDV/iPod4,1;FBMD/iPod touch;FBSN/iPhone OS;FBSV/6.1.6;FBSS/2; FBCR/;FBID/phone;FBLC/en_US;FBOP/5] iOS 6 iPod Touch 4
Mozilla/5.0 (iPod touch; CPU iPhone OS 7_1 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Mobile/11D167 [FBAN/FBIOS;FBAV/7.0.0.17.1;FBBV/1325030;FBDV/iPod5,1;FBMD/iPod touch;FBSN/iPhone OS;FBSV/7.1;FBSS/2; FBCR/;FBID/phone;FBLC/fr_FR;FBOP/5] iOS 7 iPod Touch 5
Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_6 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Mobile/11B651 [FBAN/FBIOS;FBAV/7.0.0.17.1;FBBV/1325030;FBDV/iPhone6,2;FBMD/iPhone;FBSN/iPhone OS;FBSV/7.0.6;FBSS/2; FBCR/AIS;FBID/phone;FBLC/de_DE;FBOP/5] iOS 7 iPhone 5S
Mozilla/5.0 (iPad; CPU OS 6_1_2 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B147 [FBAN/FBIOS;FBAV/7.0.0.17.1;FBBV/1325030;FBDV/iPad2,7;FBMD/iPad;FBSN/iPhone OS;FBSV/6.1.2;FBSS/1; FBCR/Carrier;FBID/tablet;FBLC/ru_RU;FBOP/1] iOS 6 iPad Mini
Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10A403 [FBAN/FBIOS;FBAV/7.0.0.17.1;FBBV/1325030;FBDV/iPad2,2;FBMD/iPad;FBSN/iPhone OS;FBSV/6.0;FBSS/1; FBCR/Beeline;FBID/tablet;FBLC/ru_RU;FBOP/1] iOS 6 iPad 2