The vast majority of my mnemonics are so quirky, personal, and bizarre, that I seriously doubt they can be of any use for others.
Unfortunately, I frequently find that I have shared a mnemonic accidentally because I forgot to deselect "shared".
I think that having to actively choose to share would be a better option. It would prevent the clutter of mnemonics too-personal to be useful for others, and perhaps it would encourage people to think more carefully about what might be useful for others.
What does anyone else think?