You can take pictures within the app or use photos that already exist in your camera roll. You can give your photo a title, which is helpful and fun. Photos can be instantly shared, not only on Instagram, but also facebook, twitter, Flickr, Posterous and Tumblr. You can also connect with your foursquare account and tag your photos with location. By default, photos are public on Instagram. If you want people to have to ask permission before they follow you, set to private. To date, I don’t follow anyone with a private account. That’s what facebook is for.