https://www.cnbc.com/2017/10/19/facebook-general-counsel-colin-stretch-to-testify-in-russia-probe.html

The lawmaker overseeing the probe into how Russian agents used Facebook to sway last year's U.S. election was hoping to hear from one of the company's technical experts.

Instead, Facebook will send its top lawyer and a former Washington insider to testify on Nov. 1.