Twitter Shares Fall During Jack Dorsey's br Senate Testimony Shares for Twitter fell as much as 6 Wednesday during its CEO's testimony before the Senate Intelligence Committee. Dorsey is testifying alongside Facebook COO Sheryl Sandberg about election meddling and abuse on br their platforms. Twitter's stock fell 1 before the committee hearing began ahead of Dorsey's testimony. Twitter CEO Jack Dorsey, via prepared statement Recently, Twitter has been accused of a practice commonly called "shadow banning." "Shadow banning" results in a platform br de-emphasizing certain accounts in br search results. Recently, Republicans have claimed br conservative accounts were br "shadow banned." However, Twitter has denied all the claims.