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Canadian judge rules thumbs-up emoji can represent contract agreement
(www.theguardian.com)
This is a most excellent place for technology news and articles.
It's a yes basically.
Q: "Can you review this?". A: "yes [I can]".
Q: "have you reviewed this?" A: "yes [I have]”.
But having to explain to coworkers that Y means yes and N means no, don't leave any room for misinterpretation.