Over the past five years, those of us who track the world of Tumblr have heard endless stories of how the platform has impacted the users who make it run each day. We've seen communities forged, artists discovered, careers born, presidents elected, marriages, users mailing each other baked goods -- even a kidney transplant. So in April, as we prepared to launch our community features blog, Storyboard, we asked users to share their Tumblr stories. We chose a few of our favorites (and you can read the rest here).