Twitter's Jack Dorsey works Capitol Hill

Twitter chief executive Jack Dorsey is scheduled to meet with top Senate Intelligence Committee Democrat Mark Warner on Thursday, according to a congressional source familiar with the matter. Twitter didn't respond to a request for comment — but Dorsey said on his own page Thursday that he is in Washington, DC.

Why it matters: Silicon Valley is paying more attention to policy matters these days, particularly Warner's investigation into how Russian operatives used social media platforms to interfere with the 2016 presidential election.