The operators of advertising fraud schemes have added persistence and the targeting of new platforms in their efforts to siphon off as much of the $125 billion online advertising market as possible, according to security and anti-fraud experts. Last week, Facebook revealed that the company had uncovered a widespread attack on its users that had compromised accounts, gathered credentials and sessions tokens, and used the access to purchase advertisements, counterfeit and gray-market goods, and to create fake product reviews.

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