I would like to have a checkmark as an emoji ✓
Like thumbs up.
C. Lee Smith commented
This lets the original poster know the message has been seen and understood, but not necessarily liked or disliked.
This is a great suggestion! As a user I often want to mark a chat item that is a task request as 'done' or 'did it' and the like icon just doesn't work to communicate that. Also another coworker uses the 'like' to acknowledge he read the request so the like is too ambiguous. If not a checkmark, perhaps a "Done!" or "Diddit!" type one-click response.