"Half of my life is on this app and now they expect us to pay for it." One-star reviews and a sense of injustice have dominated online discussion since the popular messaging app Snapchat became the latest tech firm to put a price tag on a service people previously enjoyed using for free . The app's parent company Snap announced in September it would start charging people if they have more than five gigabytes worth of previously shared images and videos saved as Memories. For many, these retro