Hello,
Sorry if this isn't the right place, but I'm willing to post this anywhere so me (and lots of other redditors) can get a response from SE on this since no one seems to be sure.
Right at the starting day of the campaign I sent out the "invite to return" to my friends that were elligible. Until now, no email. Not even one of them received it yet. I did read the rules and how the campaign would work, being sent one day per week and stuff, but come on, today is thursday and still nothing? No mail stuck on filters, spam or anything. People really wanted to play the game, but now that it's taking that long to even RECEIVE the email, plus the time they'll take to download the whole game, most of them are bummed out. And specially those friends who played the free login period at the end of the year and now aren't elligible to the campaign.
Smells like bad planning to me.