A parliamentary panel Friday questioned top Twitter officials over a whistle-blower's revelations on its India operations, and gave them a dressing-down as their replies on the issue of data security and privacy were "not satisfactory", sources said.

Top Twitter executives including Senior Director (Public Policy) Samiran Gupta, Director (Public Policy) Shagufta Kamran deposed before the Parliamentary Standing Committee on Information and Technology chaired by senior Congress leader Shashi Tharoor.