Feature summary (what you would like to be able to do and where): As a crude approximation of the on-wiki "thanks" feature, it would be cool to have a "Thanks" token on phabricator (probably 🙏, though I know not everyone thinks that emoji is a good cross-cultural way to say "thanks")

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution): Thanking after a comment is a light-weight way to express appreciation to someone's comment. One could also show thanks/appreciation for an entire task.

Benefits (why should this be implemented?): To provide an easy way to give positive feedback and appreciation.