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Are you sure you see what Googlebot gets served from these domains?
Also consider that potential backlinks to the tripod sites could easily be a private link network of sorts, which can be cloaked/banned when it comes to backlink checkers.
not sure how to check. Any ideas?
The sites are definitely not UGC
[edited by: adder at 12:42 pm (utc) on Nov 18, 2013]
Just because it works for a few days or a week or a month or even three months doesn't mean it'll keep working forever.