Sources: CEOs of Facebook, Google, and Twitter to testify before the Senate Commerce Committee on October 28; Twitter has confirmed Jack Dorsey will testify (John Hendel/Politico)

John Hendel / Politico:
Sources: CEOs of Facebook, Google, and Twitter to testify before the Senate Commerce Committee on October 28; Twitter has confirmed Jack Dorsey will testify  —  The CEOs of Facebook, Google and Twitter have agreed to testify before the Senate Commerce Committee on Oct. 28 …