About "Share" Tools
On many NPR.org pages you will find an option to "share" a page. When you select this option, you will be presented with a list of several popular sites where users can share stories with a community of users. These sites are sometimes referred to as "social bookmarking" tools.
Note that these options are separate from the "e-mail page" feature that allows you to send an e-mail directory to a friend with information about a page on NPR.org.