#ff

What does "ff" mean?
futur_foto, forFoodiebyfoodie, FlashbackFriday, FollowFriday, frenchielove_feature, frenchie_feature, fab_frenchies, fancy_frenchies, fabulous_frenchies, fastFord, FordFanatics, foto_fanatics, fa_fafedaway, fotofanatics_flowers_, fav_flowers, FitFam, fast_food, FunFact, FeelFree, fotofanatics_flowers, FridayFeeling, flaming_flora, FelineFriday, FalconFamily, friends_forever, Franken_Furnitures, FreestyleFridays, FreestyleFriday, flashbackFriday, FridayFeature

ff-f 1127785 ff-m 47239 ff-l 25376 ff-s 13703 ff-a 12851 ff-7 5454 ff-c 5320 ff-w 2693 ff-g 2554 ff-t 2149 ff-b 2117 ff-x 1871 ff-8 1728 ff-orf 29517 ff-r 1654 ff-o 1645 ff-d 1503 ff-ff- 7983 ff-文 16810 ff-fb 8288 ff-xiv 16384 ff-14 8838 ff-e 1288 ff-dp 5313 ff-xv 5463 ff-ourtwenty 13105 ff-wd 2933 ff- ar 3419 ff-fkpop 7588 ff-n member 7749 ff-af 1961 ff-15 1914 ff-wddxb 4813 ff-so 1590 ff-vii 2560 ff-bht 2488 ff-iphonesia 5104 ff- يستحق المتابعه 2252 ff-t4 1364 ff-turns1 4109 ff-tb 1217 ff-oreverf 1860 ff-ollowall 4257 ff-xivarr 3227 ff-aconv12 2018 ff-reckless 2551 ff-instabest 3483 ff-otf 1625 ff-orr 1616 ff-aweek13 1614 ff-macro members 5043 ff-ourttwenty 3337 ff- special 2015 ff-checkin 1626