TwitPic comment results in unwanted Twitter post

The TwitPic comment form appropriately warns me if my comment will be sent as a DM to the poster of a photo. I wish this were optional but at least there's a warning.

But I was very unpleasantly surprised when I discovered that my comment also appeared in my Twitter stream, with no warning. This is unacceptable.

There are so many reasons why this is a bad idea. I may leave a comment which only makes sense in the context of a photo, or is even offensive out of context; I may prefer to use my Twitter stream for a specific purpose unrelated to the topic of my comment; or I may be careful about the volume of my tweets and not want to clutter my Twitter stream with every comment.

The posting of TwitPic comments to a user's Twitter stream should be strictly opt-in on a per-comment basis.