You can designate which albums are public and which are not, and you can announce changes to your albums by sending an email to your friends. Photoshop Express lets you set up an address book for saving information about your contacts and organizing them into groups.
Because I've made my albums public, anyone can see them by visiting my personal sharing URL: http://suechastain.photoshop.com. Feel free to explore it yourself.
You can also copy the appropriate code for linking to an album or embedding the album in a web page. Currently the embed option shows a thumbnail for the album, and visitors will be taken to the Photoshop Express site to view it. Adobe has stated that they are working on an embedded player so visitors can see the slide show without ever leaving the source site.