As some of you might know there are some dodgy links flying around to send Care Packages that are currently not available.
Although it seems already sent Care Packages can work, sending them now with the hacked links can crash your homestead, all you'll see is grass and your avatars. It's also reported that they'll bust things if you place them in your wishlist.
It's always a good rule of thumb that if something isn't officially in the game there is likely to be negative consequences from exploiting the game to try and make it happen. We always suggest that you avoid exploited links and hacks as they can both damage your game and put you well into Zynga's bad books.