Oh, great. Bots are buying ads now.

Facebook said this week that an internal investigation uncovered 470 fraudulent Facebook accounts and pages linked to a Russian "troll farm" that bought 3,300 Facebook ads costing around $100,000 during the recent U.S. presidential election.

Facebook found another 2,200 ads, costing $50,000, that appear to have originated in the U.S., but with the user language set to Russian.

These ads reached between 23 million and 70 million Facebook users, according to one report, and wasn't discovered until more than a year after the first ads were placed.

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