The following notification is popping up only on the UK Help Library "PlayStation Network is currently experiencing connectivity issues. Click here for more details. 4th January 2016 at 10:20pm GMT to 5th January 2016 at 9am GMT"

Link (make sure the link says "en-gb" in it to see above's notification): https://www.playstation.com/en-gb/get-help/help-library/

holy crap what happened!?

Probably a mistake. It was down across all platforms but is back up on Vita. I doubt there would be such a big disparity on resolving them

There have been so much rumors today..

In case anyone was wondering why PSN is down, you can always check out a live DDoS map like this: http://map.norsecorp.com/ and see the PSN servers getting bombarded lol

For me its saying, that it will be back in 5 1/2 Hours !! Lets see, when i will wake up tomorrow i hope it will be fine again.^^ Also i dont know why so many people, for example on Twitter freakin out like its the End of the World ! :D

Saying January 5th 9am now, which is like 9 hours from now.

This happened last year, you'd think they'd have figured something out so it wouldn't happen again this year

Looks like they nuked PSN.

Easier said than done.  You are asking Sony to double thier infrastructure costs for the occasional ddos.

Its common in situations like this for them to scale out and rent cloud space from places like amazon, but it takes time to react.