Elon Musk has taken over Twitter, seizing control of one of the most influential social media platforms in a $44 billion blockbuster deal.

“Let the good times roll,” he tweeted Friday.

Changes to the company were immediately visible — Twitter stock stopped trading Friday, several top executives were fired and some anonymous trolls were emboldened to spew hate on the site.

But Twitter employees still had not heard from the company’s new owner on Friday. Musk has replied to a couple of posts on Twitter about his ownership, but hasn’t said much publicly.