Oh come on.<p>I have your answer: because this is a nice controversial title to post a blog under.<p>Answering your specific points:<p>1) Timezones: there's people posting on Twitter 24/7, yet this is perhaps your only half-valid point... Yes, if you're in a different part of the world twitter might be hard. But there are plenty of people in your part of the world on Twitter - try following more of them, or accept that people in a different part of the world will be less likely to post in your timezone.<p>2) Tweetie and the Twitter website both support this. Click on "in reply to" in your Twitter feed.<p>3) That's what ReTweets are for.