Can I refer someone without committing?
I think that the "Share this" link should always be displayed on an Area51 proposal.
Actually, it is only displayed if you're involved in a proposal (commited...).
But today I've a proposal that could be interesting some friends and I wanted to share the link on facebook. But couldn't find it and I had to put the link manually.
Don't get me wrong this is not reeeaaally hard to do that. But as the feature already exist, I think that it could help to always display it.