One of the most powerful vehicles for presenting your self online is your profile photo. Whether it’s on Facebook, LinkedIn, Google, Tumblr, Flickr, Foursquare, or any other site, this image, more than any other, represents who you are to others. When I first built my Facebook profile, the photo I chose was one taken at a club, right before my band went onstage. For me, it depicted the “melancholy artist” that I consider part of my self-concept. But presenting my self online in this fashion was a disaster. Within hours of posting it, I was flooded with messages from students, colleagues, and even long-lost friends: “Are you OK?” I quickly pulled the photo and replaced it with a more positive one—a sunny image of me and my boys taken atop a mountain near Sun Valley. Now I use the melancholy photo only rarely, as accompaniment to a sad or angry status update.