Among mobile ad networks, Facebook and Google remain the best bet for advertisers, according to the latest ROI Index from marketing startup Singular.

To pull together this year’s index, Singular says it sampled $1.5 billion in ad spending (from the $10 billion in spending that the company optimizes annually) and measured which networks are delivering the best return on investment. It also kept an eye out for ad fraud, apparently deleting a record 15 companies

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