stands for "It's Worth A Retweet"
When you hear something so interesting that you instantly think that you should retweet it.
Could also be called "I should quote this" but retweeting is so much funnier (and IWAR is better than ISQT)
Mary - You should follow my advice, don't choose something because it's right, just let your heart decide
Ann - Wow, IWAR!!
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