http://www.wired.com/threatlevel/2012/03/facebook-book-trademark/
“You will not use our copyrights or trademarks (including Facebook, the Facebook and F Logos, FB, Face, Poke, Wall and 32665), or any confusingly similar marks, without our written permission.”
or any confusingly similar marks, except as expressly permitted by our Brand Usage Guidelines or with our prior written permission.”
Not accepting the terms isn’t really an option for anyone with a Facebook account. “By using or accessing Facebook, you agree to this Statement,” the document says.
Facebook’s lawsuit against “Teachbook” is still pending. Facebook settled a suit it filed against Lamebook, allowing the parody site to continue operating. Facebook gained control of a porn site domain called “FacebookOfSex.com.” A travel site called Placebook changed its name in 2010, choosing not to fight—no surprise given the large expense of litigation.
“Maybe I was being naïve, but I thought I could convince the lawyers at Facebook that our site was totally impossible to confuse with theirs,” the Placebook site owner wrote in a blog.