Daughter.1 took an amusing picture, and posted it on her Facebook account. Various people told each other about it, and it "went viral", meaning that lots and lots of people told each other about it.
One Twitter user tweeted it. And it went viral on Twitter.
A big UK newspaper printed the picture. No-one asked daughter.1, the copyright holder, if that was OK. So she phoned the newspaper to complain.
The newspaper's position was that they had asked the Twitter user if it was OK for them to use it, and the Twitter user said it was. Notice - they didn't ask the Twitter user if she had the authority to give that permission.
It's a bit like if you were walking down the street, saw a car you liked the look of, and asked another passer-by if they minded if you took that car.
Newspapers get very keen on copyright, but that's when it's their copyright at stake. Do they care about other people's copyright? Obviously, not so much.
So, take heed. Any picture that you post on Facebook, or on Twitter, or on your blog, might be taken by a newspaper and splashed across their front page. And they probably won't ask your permission - if they ask permission from some random person, they think that's enough. So before you publish your wedding photos, or your baby pictures, or your pictures of yourself, you should ask yourself - would I be upset if this appeared on the front page of the Daily Bugle?