You want a profile picture that's easily recognizable by your potential Fans. That could be anything from a company logo for a big brand to a headshot of yourself if you're a solopreneur or consultant. Being recognizable is important to getting found and liked -- especially through Graph Search. When choosing a photo, make sure it'll look great in a 160 px by 160 px sizing -- though it should be uploaded in a 180 px by 180 pix box.