For some time now World Site Index has run an interactive filter on all new submissions, this filter checks the title and description for common problems such as keyword stuffing of the description, or duplicating the tile within the description.
For those that are interested the filter is written in PHP and is made freely available from our main site, just follow the link to the directory submission filter page.
As with any automated system it doesn’t get it right all the time, sometimes it is too strict other times too lenient.
Recently we disabled the filter for a couple of days to see what would happen to the quality of the submissions and if it was practical to remove the filter completely. The results were as we expected and very disappointing. The bulk of the submissions for the time the filter was disabled were deleted because almost no effort was made with them.