Instant Messenger (YIM) offer predominantly one-to-one communications, wherein one party sends out a message to a friend and waits for their response. If they're online and the response is taking a while, you might begin wondering what's keeping them so busy they can't even respond.
但 Twitter 等微網誌出現後就不一樣了，即使時間有限，他也能輕鬆透過簡單幾句話，和網友分享當下的心情或想法，不必擔心內容太空泛，也不需要背負部落格必須「文以載道」的書寫期待，同時還能繼續維持社群間的「熱度」。