Benedict Cumberbatch does not have an official Tumblr.
One Direction don't have an official Tumblr account.
She doesn't own a tumblr account :)
No, Labrinth does not have a Tumblr account.
If you go to Tumblr's home page, it has a form for you to fill out to make an account with Tumblr.
You can link your twitter account with your tumblr by following these simple steps Go to your Tumblr account > Dashboard > Services > Sign in with Twitter > Click "Allow" to grant Tumblr access to your twitter account > Check "send my tumblr posts to Twitter" And that's it, all your posts in Tumblr will automatically tweeted.
Sign up for a new account make one and get on Tumblr.
i think she dosen't have tumblr
Yes, many people have a Tumblr account.
Louis doesn't have a tumblr
http://www.(your tumblr account).tumblr.com
No you don't require a Twitter account.
Go to your email and you will receive an email from tumblr and their will be a link for you to click. Click it ofcourse and your TUMBLR account will be verified.