SEO Tip #12: What types of directories are seen as sources of paid links?
Matt Cutts: In a sense I’ve answered this question in the past but since enough people are curious to ask I’ll do the spiel again.
Whenever we look at whether a directory is useful to users we say, “ok what is the value add of that directory? Do they go out and find entries on their own or do they only wait for people to come to them?
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