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Lawmakers are trying to understand how tech giants' algorithms work

Facebook CEO Mark Zuckerberg has spent the year under increased political pressure. Photo: Jeff Roberson / AP

Lawmakers expressed concern and confusion about the role of big data and algorithms used by major web companies like Facebook and Google at a congressional hearing Wednesday.

The takeaway: Tech firms are under increasing pressure to account for their impact on society — including how information is targeted to individuals on their platforms — but policymakers have a steep learning curve when it comes to understanding the technology behind the popular services.