I would rather use a plugin for this. Sociable is a great one. Go, search for it.

All you have to do is log in to your WordPress account and edit your single.php file or your comments.php file with the following code. You need to place the code "inside the loop", most likely under the the_content( ) element.

// bookmark on Delicious
<a rel="nofollow" href="http://delicious.com/post?url=<?php the_permalink(); ?>&amp;title=<?php echo urlencode(get_the_title($id)); ?>" title="Bookmark this post at Delicious">Bookmark at Delicious</a>
// submit to Digg
<a rel="nofollow" href="http://digg.com/submit?phase=2&amp;url=<?php the_permalink(); ?>" title="Submit this post to Digg">Digg this!</a>
// tweet on Twitter
<a rel="nofollow" href="http://twitter.com/home?status=<?php echo urlencode("Currently reading: "); ?><?php the_permalink(); ?>" title="Share this article with your Twitter followers">Tweet this!</a>
// submit to StumbleUpon
<a rel="nofollow" href="http://www.stumbleupon.com/submit?url=<?php the_permalink(); ?>&amp;title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post at StumbleUpon">Stumble this!</a>
// share on Facebook
<a rel="nofollow" href="http://www.facebook.com/sharer.php?u=<?php the_permalink();?>&amp;t=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Facebook">Share on Facebook</a>
// submit to Blinklist
<a rel="nofollow" href="http://blinklist.com/index.php?Action=Blink/addblink.php&amp;url=<?php the_permalink(); ?>&amp;Title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Blinklist" >Blink This!</a>
// store on Furl
<a rel="nofollow" href="http://furl.net/storeIt.jsp?t=<?php echo urlencode(get_the_title($id)); ?>&amp;u=<?php the_permalink(); ?>" title="Share this post on Furl">Furl This!</a>
// submit to Reddit
<a rel="nofollow" href="http://reddit.com/submit?url=<?php the_permalink(); ?>&amp;title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Reddit">Share on Reddit</a>

Edit the above code accordingly :)

Sexy Bookmarks would be very beautiful and effective choice. Since this is a Wordpress plugin you can easily add more social site and update.