Description of your website is essential for submission to any Directory. The maximum length of this description for Yahoo is 25 words or 200 characters, 170 characters for LookSmart and 25 to 30 words for Open Directory.
Yahoo requires that you submit the Title, Description, Your name and Email for website submission, whereas LookSmart and Open Directory only require the Title and Description of the website.
Yahoo allows a maximum submission for one category per website; LookSmart and Open Directory allow a maximum submission for one category per URL.
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