As a developer of an app that crawls imgur for available and hidden images, please refrain from using imgur to upload any personally identifiable information. Also..
AN IMAGE CAN NEVER BE SECRET.
This old question seems to be receiving some attention today, so I wanted to provide an update. To be clear, DigitalOcean does not ask anyone to upload scans of their IDs to imgur.
Occasionally we ask customers who have set off our abuse filters to verify their accounts. This is done by emailing us scans of their ID. We agree that asking anyone for ID isn't an ideal situation, but unfortunately we deal with a large amount of abusive and fraudulent signups. The vast majority of customers will never need to provide any ID.
We point customers to http://myface.in - simply switch off posting to the frontpage when you post your webcam capture and just give them link from there.
It's an easy WebRTC Photo (high res) and GIF capture (240p) in one which is nice for ID'ing customers holding ID passport or whatever. After the ID, simply delete the capture.