The problem is you did not point the correct path of the stylesheets (CSS) - and this is due to the incorrect value of
{$my_pligg_base}
Try this:
- Go to Admin > Configure Social WTF > Location Installed
- Set the value of:
Base URL: http://www.socialwtf.com
Pligg Base Folder: Must be blank or you must see the value 'Click To Edit'