Four senior Twitter executives are leaving the media company, CEO Jack Dorsey tweeted late on Sunday night, the biggest leadership changes since Dorsey returned as chief executive as he struggles to revive the company's growth.

he update is part of an effort by Facebook to get more users.

Modi hopes to attract funds and skills from U.S. innovators to help India's burgeoning startup scene grow.

For well-travelled Modi, the first trip to the U.S. West Coast by an Indian leader in more than 30 years is a chance to get help on his top policy initiatives.

Adam Bain, the company's president and head of revenue, has emerged as an early favorite.