Also, despite having an account, I did not even get an email from them about this. Though I think I may have disabled even import site update messages when I clicked "unsubscribe" back in April on the mails I got back to back about free plushies and pizza parties or some such crap, even though I had been fairly sure in my account creation that I didn't want promo messages.
But frankly the way site messaging was handled there was one of the problems that made the site unusable for me. Even now when I log in I do not see any closing message prominently in my notice box, just a whole bunch of "recommended for you" stuff. I had to click on the Imzy group to see their announcement from May 24th, and only learned about it now by accident after seeing talk elsewhere.
Apparently the final closing date is June 23rd. But I don't have any content there, so I'm not bothered.