Only a year ago, the conventional wisdom was that blogs were dead and microblogging would soon replace them. Twitter was supposed to kill blogs because it's so much simpler to publish one sentence fragment at a time rather than whole thoughts bunched together into what is known in the trade as "paragraphs." Today, blogs are doing fine, while Twitter is struggling with flattening growth, at least to its Website Twitter.com (clients like Seesmic and TweetDeck have seen no slowdown ). The weakness Twitter has been experiencing in the U.S.