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Google and Twitter pulled into Facebook's Capitol Hill drama

Facebook CEO Mark Zuckerberg walks by a sign for Bill Nelson's office
Facebook chief executive Mark Zuckerberg leaves a Senate office on Monday. Photo: Alex Wong/Getty Images

Sens. Mark Warner and Amy Klobuchar sent letters Monday to the CEOs of Google parent Alphabet and Twitter urging them to follow Facebook in endorsing their bill to increase disclosure requirements for online political ads.

Why it matters: Beyond Facebook's privacy firestorm, Google and Twitter are getting pulled into other debates surrounding how social media platforms are used during elections. Facebook endorsed the Honest Ads Act last week in a move that armed CEO Mark Zuckerberg with ammunition for his hearing appearances this week and put pressure on its rivals to follow suit.