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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.
Its worth noting that they had completed "15 to 20 contracts previously" and that they had negotiated previous contracts via text message. This process became the norm during the pandemic.
In other words it's within this context that made it agreement... not that thumbs ups can universally be used to agree to contracts.