http://4dl.info Directory submissions briefly explained. Find more about automatic directory submitters and compare them with other kinds of submission services.
6. There isn’t much of a difference between manual directory submissions and semi-automatic submissions. The only major difference is the time it takes to complete the service.
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9. Automatic directory submissions are the best. In the past there were some issues with them (the category was not chosen, some fields weren’t submitted), but all of those got fixed. The state of the art automatic directory submitter that can even break captcha image codes: http://4dl.info