He's tweeting to his friends instead of texting everyone individually. I think some of you are confused on what twitter is actually for.
It's actual intent is not to allow people with voyeuristic tendency to decode the secrets of strangers lives.
I might be wrong, but I am pretty sure it's to communicate with other friends.
Huh? If one's intent isn't to have stragners read one's comments, then why post those comments using a medium that permits and actually encourages that precise thing to happen?