The Denny's blog reads as overly contrived to more "hip with the youth" audiences because it is constantly trying way too hard to jump on the latest trends in slang, internet grammar, memes, etc. The complete void of brand values or content on Denny's media presence (as all values have been replaced by eddying internet culture) makes for an unpleasant aftertaste once the original novelty leaves. It just leaves the audience feeling exploited or at the very least patronized. Building a brand voice requires a clear story to tell and "authenticity" (blech, I know) in how you deliver that narrative to audiences. The Denny's online brand has no story other than keeping up with disposable internet ephemera (nihilism is in this year for memes, run with it!) and as a result rings hollow.
Perhaps. But when you consider the platform each targets (Denny's on Tumblr - younger, values visual content. Merriam-Webster on Twitter - older, values witty shortform word) this is excusable.
Denny's is often the only restaurant open at 3AM. I've been there more often between midnight and 6AM than any other times...
Avoid any form of potato there except the hash browns, which are decent. Avoid any cheese sauce. Everything else will be recognizably high-calorie food.
Right now the best thing on the menu is the pot-roast melt sandwich on multigrain bread.
The Denny blog - http://blog.dennys.com/ - is similar. A hilarious blend of surrealism and non-sequitur.
I've never eaten Denny's in my life but I hope it's as delicious as its social media is witty.