Barnstars and other WikiLove
If you want to recognize another editor for doing good work, or you want to say "thank you" for their help, or you just want to be friendly, you can share WikiLove with another editor. Just go to the person's userpage and click the heart icon to bring up the WikiLove tool. You can select what kind of award to give them, add a personal message, and automatically add it to their talk page.
This video gives a little bit of background on barnstars, the traditional symbol of appreciation for good work on Wikipedia, and shows how to award them with WikiLove.