[krock]

I think I will use them this way:

* '+1' to mean I like this feature or this issue affects me.

* 'heart' to mean I agree with a proposed solution, or pull request.

* 'hooray' when a solution is marked as fixed or a fix version has been posted for the issue.

There are no rules though, so we'll see.

[mattcantstop]

Internally at GitHub over the past few weeks I have been using the heart reaction to express appreciation. For example, if someone is very helpful or empathetic I let them know I appreciate it with a heart.