iCloud does not work at the moment for millions of iPhones, iPads or iPod Touches around the world, Apple's services being completely unavailable, along with the dedicated website.
The problems initially started with the iTunes Store and were transferred to the App Store, but at the moment it seems that various iCloud services do not work, especially outside of Romania, where the iCloud website cannot even be accessed, it showing a connection error.
If you're having problems using iCloud at the moment, then you know what's behind them, but if everything works as it should, then you don't have to worry too much.
