I think I have the answer.
It's all about them.
It's not about you.
The site has to offer something of value to the visitor.
Most often, I think it's deep, detailed, insightful information about a specific topic.
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Sometimes it's an incredibly useful service.
Sometimes it's the sheer entertainment, or beauty, or novelty.
But, bottom line... it's all about them.
Digg It!
Bookmark it!