SF Chronicle: [Opinion] Open up the black box of political advertising

By Christopher S. Elmendorf, Ann Ravel and Abby Wood

As Facebook turned over more than 3,000 Russia-linked ads to Congress, Mark Zuckerberg acknowledged Thursday a more subtle but equally disquieting feature of Facebook-mediated politics: “You … don’t know if you’re seeing the same messages as everyone else.” This might seem trivial, but it’s becoming a very serious problem — and it’s one that San Francisco can help fix.

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