I use it for organizing my own personal timeline from old photos, old school work, and other dates and events from my life. Basically anytime I come across something with a date on it I'll snap a pic and add it in. Fun to unlock new memories by discovering when one event occurred in my childhood compared to another.
Also, I use the tracking feature to document what video games I've complete. I usually include a pic of the credits screen, a small review of what I thought of the game, and add a rating to each.