Dave Winer gives 3 reasons why you should be posting short items to your blog, including:
"Maybe your blogging software doesn't support short items? Don't worry, if people post more short items the software will adjust."
I’m counting on this. I have a separate RSS feed for microblog posts, and it doesn’t look great in some news readers because the title is blank. Some folks have asked whether I should include a fake title there — the first few words of the post, or a timestamp. But the RSS spec is clear that title is optional. Only by breaking things a little will RSS readers improve to gracefully support title-less short posts.