Pick something, mark it, and nobody doubles up.
What's Jenna's birthday?
Welcome, Jenna! Pick your own PIN
4 to 8 numbers. You'll use it to get into your list from now on, so don't use your birthday. Everyone else knows that one.
Paste several links at once (one per line) to add them all. No link? Add one by hand.
It'll show as taken so nobody doubles up. Nobody sees who took it, Jenna included.
Saved on this device. Tick them off as you buy.