Any written communication (such as email or SMS) can be considered as evidence in court (NOTE: just evidence, not a signature). That's why M&A departments don't

Any written communication (such as email or SMS) can be considered as evidence in court (NOTE: just evidence, not a signature). That's why M&A departments don't do deals or negotiations over email. But that's long form. Emojis on the other side are very short. It's a new medium and doesn't have a stable interpretation yet. Also, any contract negotiation is a process (sometimes even a Saga ;) Plucking a single message out of a sequence of messages is wrong.