Saverin started Facebook with Mark Zuckerberg and left after a falling-out. : Eduardo Saverin, co-founder of Facebook Inc., said social networks are heading for more regulation and change, as political pressures mount and users fragment into specialized interests. Governments will inevitably get involved in regulating networks like Facebook and Twitter, he said. He spoke only hours after Facebook Chief Operating Officer Sheryl Sandberg and Twitter Chief Executive Officer Jack Dorsey appeared before the U.S. Congress in the wake of attempts to manipulate public opinion and interfere in elections.