> was no algorithm that could detect a high-quality review from a spam one In that scenario, the search engine could show an empty page plus their screened ad

> was no algorithm that could detect a high-quality review from a spam one In that scenario, the search engine could show an empty page plus their screened ad network results. Perhaps a link for querying Reddit or other social media. For the most profitable/contested review queries, some combination of algo and paid humans for feedback/curation.