140 characters is not enough space for a URL and commentary. You end up getting things like this:<p><a href="http://yooplace.com/thread/seths-blog-like-your-hair-is-on-fire-1db5/" rel="nofollow">http://yooplace.com/thread/seths-blog-like-your-hair-is-on-f...</a><p>Each of these "comments" works more like an upvote than anything else.