Publishing blogs as books

From the fridayproject.co.uk. So this company has announced that it will produce books based on popular websites. What does that really mean? I considered myself to be an internet girl but not, like, crazy with it. But I could probably count the amount of blogs/websites that would be good books? Now if they presented it as publishing books say around the theme of a website or from a certain personality (like Wonkette for instance) and using the website visitors as built-in markets, that would make more sense to me. But that doesn't sound like what they are doing. I would really want to know what websites they were talking about.

“The Friday Project is the first mainstream publishing company
to specialise in producing books inspired by popular websites,”
explained Publishing Director Clare Christian. “A few publishers
have begun to realise the importance of the web-to-print market
but until now no one has truly put the Internet at the heart of their
publishing strategy.” Editor-in-Chief, Paul Carr added “After years
of working in both online and print publishing, we’re really excited
to be in a position to bring those two worlds closer together. We’ve
already signed up some of the web’s most creative sites and more
are coming on board all the time. It’s great to be able to take the
massive creative talent that exists online and bring it to a wider audience”