socialphobia.wordpress.com is no longer available.
The authors have deleted this site.
Registering that deleted URL is not possible.
Note there are multiple warnings given that blog deletion is permanent and irreversible. A verification link is sent in an email and must be clicked to delete a blog. If clicking that link does not work then copy and paste it into your upper browser window and click. You clicked the link and that URL is no history.
See here http://en.support.wordpress.com/delete-site/
Deleted blog URLs are not recycled, regardless of who registered and deleted them and no exceptions are made.
You can register another blog with a similar name. http://en.support.wordpress.com/register-a-blog/
Or you can register a domain via a domain mapping upgrade and it will not matter what the underlying .wordpress.com address is.