Polish airline LOT was grounded after 'IT attack' took hold

there are worse places to be stuck (as long as you are in a nice hotel)

i was stranded there where eyjafjallajökull hiccups

it only takes about a day to get back to london by train, sleeper warsaw-köln (book in the highest class you can get), thalys köln-brussells, eurostar brussels-london, it's advisable to take a hamper and plenty of beer and/or wine

Airport != Airline

Just a minor nitpick.

What you quoted when you said "The [LOT ]company used Twitter" is actually the feed of Polish Airports, specifically the Warsaw Airport's one. It's basically like British Airways vs Heathrow Airport Holdings (the actual LOT feed, curiously, seems to be defunct).

Funnily enough, this distinction is not always apparent to people who apply for jobs there, resulting in e.g. this conversation:

Candidate: "Well, one of the reasons I'm applying is I always thought working for Polish Airlines would be fun!"

Recruiting employee: "Yeah, that would be our neighbors from the office down the street..."

What Mikko said.

The news as reported make no sense whatsoever.

I do wonder however which system they use.