New Delhi: Musk tweeted a meme late on 7 Jan, criticizing Facebook for its inability to stop Capitol chaos going viral.
The tweet posted an image of a series of ever-larger dominos, juxtaposed the start of Facebook on the Harvard University campus, all the way into becoming a platform that helped facilitate the attack on Capitol Hill.
"This is called the domino effect," Musk said in a tweet.
A vocal critic of Facebook-owned WhatsApp, he added: "Use Signal".
Signal then saw a flood of new users attempting to sign in.
"Verification codes are currently delayed across several providers because so many new people are trying to join Signal right now (we can barely register our excitement). We are working with carriers to resolve this as quickly as possible. Hang in there," Signal tweeted.
"Everyone should be able to register without delay again. Thanks to all of the carriers who flipped the right switches so that people can keep switching," it further said.