Snape's birthday...will she or won't she?

[potioncat]

 juli17 at ... wrote:
  
> So, will JKR wish Snape a "happy birthday" this year, or won't she?
> And what will it mean if she does or doesn't do so?

Potioncat:
She wished him a happy birthday last year, after HBP.

I'm not sure what to make of the happy birthday list. Why are some 
names not on it? Why are Draco and Snape there at all?f

Potioncat (baking a cake, all the same.)