It's the one that pops up when you go to your inbox. (I don't know if it's actually something that pops up when the time comes, or if you HAVE to go to the inbox. I mean, I was on dA ALL day, and when I went to check my inbox, it popped up.)
It just congratulated me for being here for a year. And it also tried to convince me to buy premium. All I remember word for word is "Taking your art srsly". (sorry ) (i posted the comment wrong, sorry again! )