San Francisco: You will soon be able to know why certain tweets go unavailable in your conversation thread on Twitter. The micro-blogging platform is working on to “add context” to “this tweet is unavailable” notices. “We’re fixing the issue where you see so many ‘This Tweet is unavailable’ notices in conversations. This is usually due to deleted or protected Tweets, or muted keywords,” There are several reasons why a tweet in a conversation thread is unavailable, like policy violation, deleted because of certain specific keywords present or muted by a user. (IANS)