Permalink in WordPress for set your url be ‘topic url’ [url hack] in wordpress CMS
1. Login Admin > Settings > Permalinks > Select ‘Custom Structure’ and code in to
ex.

/%postname%/%post_id%/
%year%
%monthnum%
%day%
%hour%
%minute%
%second%
%postname%
%post_id%
%category%
%author%

2. Click ‘Save Changes’
3. The box below is the code, to Select All> Copy all
4. To put in Notepad or EditPlus > Save As to ‘htaccess.txt’ on your computer anywhere.
5. Uploads htaccess.txt to the Folder on the ftp htdocs or html (depending on your host).
6. Right-click on ‘htaccess.txt’ file and change to ‘.htaccess’
successful !!

note
1. you can Install ‘All in One SEO Plugins’ and ‘XML Sitemap Gen’, it make your website cool!
2. If can not work, Create a file ‘.Htaccess’ and chmod to 777 and whenever you edit permalink after, do not fix again, coz the system can auto fix overwrite.

If your want to submit site to Pligg Web Site or digg.
your promote a link may be the problem coz your WordPress use the permalink with long topic.
suggest you add this code to ‘single.php’ page

<?php echo get_bloginfo(‘url’).”/?p=”.$post->ID; ?>