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We've just launched an update to NS to allow you to login using Facebook. New users to NS can now register using Facebook in just 3 clicks. But for you existing members, you can also link FB to your account from your Account Settings (below your username in the header). This will allow you to one-click login to your existing NS account.
Of course this is optional for all usesrs, and the association with your Facebook account can be removed through Account Tools.