Actually, I thnk it's only for your followers.
Which means to get a buzz going that will be noticed by the right people, we really need names of the casting directors when hot projects are in the works.
Where twitter helps is in quickly alerting Connor's fans when an opportunity arises.
Yeah, Twitter is going ti serve a dual purpose that way--quick communication between fans from multiple communities and, once we find out the studios that are involved, we can bombard them with tweets.
In terms of your account, I believe anyone can look at your account and see the tweets you make, unless you set your account to private.