Where did all the books go?

Firstly, I must admit that I am not experienced with the realm of blogs - but don't get me wrong , I do know that blogs exist, that they are hovering around out there in cyberspace, however until now there hasn't been any obvious reason to investigate this phenomenon.
I like to think I don't have an aversion to the blog, I just seem to have an aversion to becoming a blogger ... but maybe that could change if it agrees with me.
One thing that is completely new to me is the fact that there are many people out there cataloging and reviewing books plus other media through online social cataloging networks. This shouldn't surprise me as much as it did, since the net is a big place and there's alot of people out there.
iLibrarian has made it easy to see the tip of this online ice berg with its list of Ten Websites For Book Lovers. It assumes that the reader is already familiar with LibraryThing and other popular social sites, going for some of the lesser knowns. Many of them share similar features such as cataloging, writing book reviews, creating book clubs and having meetings.
Funnily enough it was number 10 on the list that really jumped out at me. PaperBack Swap is all about swapping real books. Actually sending them by post ... no not an attachment in an email, the real thing - snail mail. Anyone feeling nostalgic right now?
To signup there is an annual fee of $20, but I imagine it would be well worth it if you happen to be situated in the US. I'm guessing that there are similar networks for swapping books in the Southern Hemisphere.

Will keep you posted...