If you look under someones avatar in a post, there's a picture of a little envelope, that if you click on, it emails them. MY EMAIL IS VISIBLE on every one of my posts. I don't like this, it's a potential MAJOR spam issue (I've changed my email since realizing this). This is SUPPOSED to be a way you can opt out of... by going to - Profile > Account related settings, and CHECKING the box Hide email address from public...but it DOESN'T hide the email addy