When you go into Album Setting, there are two options for Sharing. See the screen shot below. The default "Shared" setting (green icon) allows visitors to see that specific album when they receive a link to it (via email, blog post, etc). Additionally, if you select "Also share on Photoshop.com" then this album will be visible to anyone visiting your gallery of shared albums--this album will be available to anyone who can find your personal gallery page, perhaps from a separate link to another album.
Just be sure you choose the right settings, based on whether you want everyone to see your albums, or only those who obtain a link to specific, shared albums.