How fandoms act on Tumblr:

Doctor Who Fandom:Ruining hipster posts since before there were hipsters, and giving everyone whiplash with plot twists.
Sherlock Fandom:Takes one look at your blog, and suddenly knows everything about you. Then declares that you will be 'BFF's 5eva' and that you're moving in together immediately. Everyone thinks you're a couple, but you're not- YES YOU ARE.
Supernatural Fandom:Once they find you, you're family. It doesn't matter who or what you ship, they'll love you anyway. They'll be there for you until the end of the world. Literally. (And probably even after that, 'cause knowing them they'll just bring you back) But if you attack their OTP, there will be blood.
Avengers Fandom:They've got happiness, hugs and a Hulk. If you don't like Loki, you're wrong. But apart from that, everything is costumes and rainbows and saving the Earth.AND BUTTS
Hunger Games Fandom:ARROWS AND FINNICK'S UNDERWEAR. AND EVERYONE ELSE'S.
Hetalia Fandom:An annoying bunch, but one of the nicest there is. It doesn't matter who you are, they will welcome you and offer you all the pasta in the world, because the world is a beautiful place and everyone is equal. However, if you diss a ship or tag hetalia things with actual country names, you are fucked for a good month or so.
Homestuck:LEFT OUT OF ANOTHER MULTIFANDOM POST.
Game Of Thrones:Weary of new people, but once they gain your trust, they swear fealty to you and will help you defend your kingdom until their dying day.