If you look at html source of the index page of a pligg site, you will find that there is an invisible tag that combines all tag words but with no anchor text.
E.g., if you view the source of Pligg Beta 9 / Published News
The tags of the second entry looks like this:
<a href="/demo01/search.php?search=free+desktop+wallpapers&tag= true" style='text-decoration: none;'>free desktop wallpapers</a>
<a href="/demo01/search.php?search=wallpapers&tag=true" style='text-decoration: none;'> wallpapers</a>
<a href="/demo01/search.php?search=free+desktop+wallpapers%2Cwallpa pers&tag=true" style='text-decoration: none;'></a>
Notice that the last tag is a combination of all tag words but there is no text anchor word before </a>
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