Isn't it the case they reject duplicate Tweets if you try to post the same thing twice consecutively? I've not seen them reject duplicate Tweets if there is intervening posts.
Personally I think this is a really bad move on Twitter's part. Because of the streaming model of Twitter itself and the fact that not every follower will see every Tweet that you do, not being able to do recurring Tweets leaves businesses without the ability to economically get a consistent message out onto their account. It also looks like a very anti-competitive move to all the ad stream businesses out there. Certainly there are some ad companies that have abused recurring Tweets, but without the ability to do recurring Tweets, the motivation for many businesses to maintain a presence on Twitter just dropped because there's no better way to capitalize on the labor and expense of building and maintaining a following. So much about promotion of business has to do with consistent message and creating brand presence with that consistent message. Is Twitter carving out space now to do their own in-stream ad busines? Are businesses shut out that want to promote themselves on their own account without having to assign a person with a paycheck to get a simple and repetitive task done? A short sighted move it seems to me. If Twitter doesn't want businesses on their service then they're going in the right direction.
