On Tumblr the past few weeks, everyone has been shipping Denny's resturant's blog with a number of other official blogs from other restaurants including Longhorn Steakhouse (RIP FOREVER BEST BLOG). Here's a Daily Dot article about Denhouse.
However, it seems that now people are making "official" blogs for other food brands as part of the Foodom fandom. Foodom tag and Fooddom tag.
Here is a blog post by the amazing bluechoochoo about these fantasy blogs
here is a list of a number of fake ones (mixed in with real ones, like denny's
The woman who runs the Denny's tumblr let me know that if a brand is verified, they should be listed here, but this is not a comprehensive list.
Thoughts? Research? Someone want to start an entry? :D