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If I had to guess why I would maybe say that Hubski is really quick to teach you about its mechanics. I knew what I was doing after 10 minutes of actually being a part of the site. The other sites or at least the ones I tried weren't as quick to educate the user. Granted it doesn't take away from the fact the writer did a poor job reviewing the other sites, it just also means he/she may havr done a shallow job.