That being said if you're not actually going to use your account you might want to at least consider giving it to someone who would put it to more active use. Just a thought.
Just how much of the "real world" law you're alluding to by using the term "ownership" do you suppose applies to Twitter handles? (or Gmail addresses, or Facebook pages, or even domain names?)
I just don't quite see how a username is 'owed' to other people who would use it more, either.
Also, a Mercedes and a twitter handle (or domain name) aren't exactly the same thing as a twitter handle is a unique owner of a particular pice of the namespace.
A better analogy would be an owner of a valuable piece of property who wasn't putting it to good use.
So if you were not putting your backyard to good use you would not feel too bad if your neighbors decided to encroach on it?
For example, I used one email for most of my life. But recently, I stopped using that email address, and have used another one due to wanting to boycott that company. Since I no longer use that email address, I should have to give the password to another person. This is just the right thing to do in all cases.
That would FREE UP a lot of email addresses. If you have any email addresses that you do not need, you are obligated to give your password to another person. If you don't, then they can't use email.
Just make sure that if you use that email to sign in to other websites using that email and password combination, go to all of those websites and notify your friends that you are giving your email to someone else and you are not the same person if you see future comments using that name.
Or is it just vaguely notable?