If you used a digital camera in the early 2000s, there's a good chance whole chapters of your life have been erased. A generation of photos has vanished on broken hard drives and defunct websites.For my 40th birthday, I asked my friends and family members for one gift: pictures of me in my early 20s. My own photo collection from that era – roughly 2005-2010 – is devastatingly scarce. There's a blank space somewhere between my albums of printed college photos and my Dropbox folder of early motherhood snapshots. All I could find from those years was a handful of...