Ok, from what I’ve found, these are all officially confirmed. Don’t trust any accounts that “claim” they are the boys unless they have proof.

Twitter

Harry: @Harry_Styles

Liam: @Real_Liam_Payne

Niall: @NiallOfficial

Zayn: @zaynmalik

Louis: @Louis_Tomlinson

One Direction: @onedirection

Facebook

Harry: http://www.facebook.com/harrystyles

Liam: http://www.facebook.com/LiamPayne

Niall: http://www.facebook.com/Niallofficial

Zayn: http://www.facebook.com/zaynmalik

Louis: http://www.facebook.com/louis.tomlinson

*note: they haven’t updated these accounts at all

One Direction: https://www.facebook.com/onedirectionmusic

Tumblr

http://onedirection.tumblr.com/  is the only confirmed url.

Instagram

Harry: harrystyles

Louis: louist91

Niall: nialler1993

Zayn’s is private.

Formspring

http://www.formspring.me/onedirection

Bebo

Louis: http://www.bebo.com/louis069 (so much selfies, gotta love Lou for that)

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Don’t bother messaging for One Direction’s urls.

Niall tweeted that he never had one.

Liam used to be ohnoitspayne. (It WAS real, he announced it on Facebook, only to delete the tumblr account a day after.)

Louis is therealtommo but his account is password-protected. It used to be open to everyone.

The Zayn and Harry accounts could be real, or fake accounts.
But even if they are, I think after all the work they’ve done, they should at least get their privacy online.

All i can say is that the only confirmed account is onedirection’s official tumblr.

So show some love & support by following them! ♡