Social.me is an icon set consisting of 30 individual icons of the popular social networks/Web 2.0 sites out there.
Give your visitors the opportunity to StumbleThru and rate the best of your content—all while never leaving your website! StumbleUpon’s Partner Program makes your site more engaging and relevant while increasing your potential for viral distribution.
* Offers a personalized and engaging way to display your content
* Allows your visitors to rate and submit your pages to StumbleUpon—increasing your website’s potential for viral distribution
* Includes tracking and analytics to help you gauge user response and improve your content targeting
The ShareThis WordPress plugin provides a quick, simple to use, and unobtrusive way for users to add your post to many social bookmarking sites, or to send your post link via email, AIM, Facebook, MySpace and more.
http://wordpress.org/extend/plugins/share-this/
The 3rd-party Subscribe2 plugin allows registered and unregistered users to be notified via email whenever a new post is published.
It allows users to subscribe to either full posts or excerpts of posts, to choose whether the format of full posts should be HTML or plain-text, and to select which categories they are interested in.
Subscribe2 was enhanced to work with Social Access Control so that users receive emails only for posts or categories of posts that they are permitted to view. Also, the administrator can choose additional email content levels depending on whether the post is public or restricted: full post, excerpt, title only, no email.
http://wordpress.org/extend/plugins/subscribe2-for-social-privacy/