The best Slack channel is the "thanks" Slack channel. If your organization doesn't have one, set one up as a place for people to share praise and shout-outs and appreciation for big & small things
@laurahelmuth I think this is a good thing that a lot of people benefit from, and hope that slack adds the ability to opt out of mentions in a channel for those of use who would prefer to not receive gratitude/appreciation in such a fashion.