Hello,
First of all please check you've followed the instructions mentioned in our blog (and several times in a couple of more places) in order to request an invitation. This is the only thing you have to do (and asking for invitations here on forum is NOT a step of it).
In addition to this, as also mentioned several times, as we are conducting the campaign through twitter we have to comply with twitter's usage policy, which effectively means keeping a low profile, which results in a relatively slow processing time.
Thanks for understanding.