I quite wouldn't say # of items be the right approach, but rather 'average customer rating' as a combination of # of items would be useful. Mere item-count is easily inflatable by publishers/eCommerce to get its ranking up.
My 2 cents.
Best posts made by twnSEO
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RE: Number of Items As a Google Ranking Factor??posted in Algorithm Updates
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RE: Social Media + MOZ Open site explorerposted in Social Media
I support with Yusuf's answer.
It picks the count of mentions in the specific URL (homepage), rather than cumulating everything under the domain. I guess, MOZ needs to work on that to get a good match with our actual mentions from our internal reports.