About 11,000 people liked the Facebook page for the "Yes California Independence Campaign" as of Tuesday night. By midday Wednesday, it had grown to nearly 17,000 likes and counting.
"Obviously it was a huge boost for the movement because Californians hate Donald Trump," said Marcus Ruiz Evans, vice president of the group.
The hashtag #Calexit was already trending on Twitter and Facebook on Wednesday. Posts ranged from Shervin Pishevar, a Bay Area venture capitalist and tech entrepreneur, calling for the state to secede, to conservatives welcoming a California-less nation.
Ruiz Evans said Yes California intends to launch an initiative that asks Californians whether they believe the state should remain part of the United States or break away on its own. Similar to the Citizens United ballot measure voters approved Tuesday, it would begin as an advisory proposal to kick-start an arduous process.