Yes, it is a great way to relieve stress. It really depends on the person as some people may take to writing, others drawing or singing. This can regularly change as well. I used to write poetry when I was stressed in High School. Since then I had stopped, yet, I have sung, wrote music, drew, and danced. It is a great way to express yourself, you just have to find your niche. Even if your not "good" who cares as long as you're blowing steam.
Sharing with others works the same way. As it is relieving you from the burden (or so it feels). Generally, once you have be it socializing or a form of art, you feel much better, and are able to continue with the day.