Are you on facebook? A week-long diary chronicling what's doing with books on the Web's second largest social network.(Social Networking)(Diary entry)

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MySpace is over, it's just not cool anymore." So say the teens Lynn Hirschberg talked to for her recent article "The Music Man" in the New York Times Magazine. Grown-ups like Lee Lorenzen, a venture capitalist who has invested in Facebook-affiliated companies, agree: "MySpace is not based on authentic identities," he told the NYT. So what's cool now? For the moment, it's Facebook, the social networking site founded by a Harvard student in 2004 that's "based on who you really are and who your friends really are," as Lorenzen says. "That is who marketers really want to reach, not the 'fantasy you' that lives on MySpace and uses a photo of a model."

Brands including Blockbuster, Conde Nast and Coca-Cola are all clamoring for the attention of Facebook's 60 million members, 40% of whom are over the age of 25. Is there room for book publishers and booksellers, too? The number of book-related tools on Facebook suggests so; out of the 5,000+ "applications" that exist on Facebook, some 125 of them are books-related. This week-in-the-life diary reveals what these applications are, how to use them--and why publishers and booksellers should care.

Monday

Number of books read about: 181

Number of people contacted about books: 3

Number of virtual gifts received: 1

* 10:19 a.m.

I log in to my Facebook …