Why can't other people see my site?

In Notanant you can set permission levels for the visibility of your site. To change the visibility to the public go to 'Site Settings', then 'Permissions'.

'Show as open/public org?' sets the site to be visable in lists and links. The access to a site can be defined in more detail using the public, guest and member permissions settings. Using these you can set different areas and content of the site to have different access levels.

If you have set 'Show as open/public org?' to yes and the site is still not visible make sure the public permissions are set to 'read only'