Facebook made a potentially significant status update in late May, 2012. On its Statement of Rights and Responsibilities, which was released to its users, Facebook made this statement:

"You will not use our copyrights or trademarks (including Facebook, the Facebook and F logos, FB, Face, Poke, Book and Wall), or any confusingly similar marks, except as expressly permitted by our Brand Usage Guidelines or with our prior written permission".

The other terms have been in the Statement before, but "Book" popped up in the latest revision. The social network apparently wants to prevent other websites from using [1] followed by "Book" in their name; they hit teachbook.com with a suit, claiming that the word "book" dilutes the Facebook brand.