WSJ's Joanna Stern "bumps into" the Allbirds co-founder and co-CEO Tim Brown in the WSJ elevator and asks him about the company's new shoes, incessant Instagram ads and plans to go public.

Musk tweeted on Saturday that “soon we shall bid adieu to the Twitter brand and, gradually, all the birds ... NBCUniversal who started as Twitter CEO on June 5, told employees in a memo ...