Directories are usually human-compiled guides to the web, where sites are organized by category. The chart below compares the size of directories at various services, along with other key data.
|Open Directory||D||36,000||361,000||2.6 million||4/01|
|Yahoo||D||100+||n/a||1.5 to |
|HotBot||SE||See Open Directory|
|Lycos||D||See Open Directory|
|MSN Search||SE||See LookSmart|
|Netscape||SE||See Open Directory|
Type: Shows whether a service is primarily a directory (D) or a search engine (SE).
Editors: Shows how many people are involved in producing the listings. More is not necessarily better, as some services claim that technology helps them do more. However, a large number of editors can be a good sign that a quality directory is being built and keeping up with the growth of the web.
Cats: Shows how many categories each directory has.
Links: Shows how many unique URLs exist in the directory, usually as reported by each directory or drawn on recent interviews I've conducted. In the case of Yahoo, a range is shown. The upper figure comes from going into each major category and adding up the counts for each subcategory listed. However, since some URLs may appear in more than one category, this method may produce an overcount. Thus, an estimated lower figure for Yahoo is also shown.
As Of: Shows how current the information is, for each directory.
A current self-reported count can always be found at the bottom of the home page.
ODP and Yahoo Size Projection Charts
Provides estimated counts for Yahoo and compares to the Open Directory, over time.