A stranger has signed up for my twitter feed, which is fine. If someone's life is improved even slightly by reading my 140-character-or-less missives, then what the hell.

But there was this note on their twitter page:

This account is currently suspended and is being investigated due to strange activity.

If this is your account, or for more information about why an account may be suspended, see Suspended Accounts.
Spam is the big reason for suspension, but there are other reasons, like this:
4. You must not abuse, harass, threaten, impersonate or intimidate other Twitter users.
Hopefully I haven't run into my first twitter wacko.