Some fans were frustrated, and vented on social media. One said, "I spent literally an hour refreshing for the burger pass, what incredible incompetence."

Someone else said, "It was literally easier to get tickets to Taylor Swift than it is to get a Red Robin burger pass."

Red Robin did apologize for the site going down, saying, "We did everything we could to anticipate interest in the Bottomless Burger Pass . . . but due to overwhelming excitement, our website and supporting systems crashed."

They're also hyping another sweepstakes that offers free burgers for a YEAR. They've posted details about that on their site . . . which is back up . . . but there will only be 12 winners, so that's like Taylor Swift V.I.P. tickets.

Speaking of chain restaurant promotions, Buffalo Wild Wings is doing another dine-in, "all-you-can-eat" boneless wings promotion on weekdays.

It isn't free . . . it costs $20 . . . but if you can eat 20+ wings, this is at least a 25% discount. The only rule is NO SHARING, so maybe you could sit there all day and eat all your meals there.

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