You really need some sort of privacy policy (or at least some way to contact you) if you are really want people to get personal on your site.
If you're interested I've written some basics on creating a policy on my blog here: http://jnorthrop.me/2012/04/3/getting-your-privacy-policy-gr....
I hope the link helps, and feel free to ask any questions (my email is in my profile).
