FreeTellaFriend.com is a free service that lets you add a ‘Tell a Friend’ button to your blog posts or website articles.
FreeTellaFriend is actually three different functionalities rolled into one – Sharing your post through email, Sharing it on a bookmarking site and Bookmarking the post in their browser.
It has some really nice and useful features. For instance, instead of typing the email addresses of their friends, FreeTellaFriend can fetch email ids from the address books of your visitors. It can fetch from most popular email services like Hotmail, Yahoo, Gmail, Live etc. It lets your visitors share your site on more than 50 bookmarking sites.
WordPress users can easily incorporate the button by installing the available plugin.