What profile information can others see about me?

UPDATE:

They can see your photo or icon, your user name, your tagline, location and website URL if you added them. They can also see conversations you've participated in as well as stats about your site usage and involvement like how many topics you've started, how many replies you've given, how people are following your topics.

They can not see personal information like email address and your real name unless you've elected to display your real name.