Twitter is a platform where you can quickly share your thoughts in neat, 140 280 letters long snippets. No other social network is as fast-moving and up-to-date. Another differentiating factor is that you can't comment on Tweets like you can on Facebook posts — instead, you need to reply with a tweet of your own to take part in a conversation, making discussions messy and hard to follow. Twitter knows that. Besides working on a complete redesign of replies over on iOS, the company is testing a tweak to its Android app by adding a new icon for us to click: "Subscribe to conversation."

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