But it can be spoofed. I went with 5555555555 so check and see if it will let you also use that. (Yes, I did not include any punctuation or spaces.)
They don’t even bother with the false pretense that it will help you get back into your account. (Obviously false since an email serves the same purpose)
You can also get around it by using Twitter or Facebook to log in, assuming you have an account that doesn’t have your phone number on it.
I almost put this in the Pit. Instead, they’ve just assured that I will always watch their shows with Adblock on. I’m actually tempted to make a Facebook page with a bunch of fake info and linking that to my account, too.
EDIT: It only applies to new accounts or if you try to comment on a new show page.