The girls show more skin these days, but I think, generally, they behave the same way as when I was growing up.

I used to be an editor and I was editing young adult series. I didn't really like the books that I was reading, so I decided that I would write a book about something I'd want to read if I was 16. It turned into a Cinderella story... I developed a proposal and the characters of 'Gossip Girl' for my job.

I decided that, if I were to write a teen series, I'd want to set it in a place that was familiar to me - Manhattan, where I'd grown up - and I'd model the characters on myself and my friends.

Back in my days as a children's book editor, my superiors caught on to the fact that teenagers were using the Internet to gossip about each other, and thought it might be nifty to develop a series of books about an anonymous high-school blogger who gossips about her classmates. The concept was passed on to me.