Mark Zuckerberg set off a rapid reversal of policies — from DEI initiatives at Facebook to recommended political content at Threads and Instagram — and finished the week off with a nearly three-hour interview on the Joe Rogan Experience podcast.

I'm counting on these changes actually making our platforms better," Zuckerberg wrote on Threads, the X-like social media site owned by Meta.

After visiting President-elect Donald J. Trump in November, Mr. Zuckerberg decided to relax Meta’s speech policies. He asked a small team to carry out his goals within weeks. The repercussions are just beginning.