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Incubator-testbed.duolingo has the lowest Google pagerank and bad results in terms of Yandex topical citation index. We found that Incubator-testbed.duolingo.com is heavily ‘socialized’ in respect to Facebook shares (457K). According to MyWot and Google safe browsing analytics, Incubator-testbed.duolingo.com is a fully trustworthy domain with no visitor reviews.