Ok I will play.
Firstly, to get this out of the way, your attitude doesn't really belong on HN and these petty arguments don't contribute to the discussion.
Let's look at how I believe it is revolutionary for the Chinese restaurant.
* They now have an easier, more convenient and better way to contact and be in constant contact with their customers.
* They have pretty good data on their customers. Their ages, their genders, their education status and more.
* Easier transition to online business. If they decided to provide an online service they already have an attentive customer base to work from.
For what it is worth, I do think most "social media experts" are full of waffle.