from the do-morons-in-a-hurry-read-books? dept
I looked up the trademarks they listed in their C&D letter and they all seem to apply to educational programs designed to promote children (pre-k to 12th grade) to read through incentives and stuff. Members of the 100 Books Challenge groups on LibraryThing, however, only commit to reading at least 100 books in one year, with no set curriculum, reading levels, or prizes, and all members of LibraryThing are, by law, over the age of 13, due to the COPA, and as such, are not "children."
I do not know if they've sent a similar letter to other sites that have a "100 Book(s) Challenge," such as another social cataloguing website called GoodReads.."
There are certainly questions about whether or not there's any likelihood of confusion here. I have a lot of trouble seeing how any such confusion would result. It also seems like the term is being used in a descriptive way (it is in fact, a 100 books challenge), which you would think would help qualify as fair use. But, of course, just going through the process of fighting such a claim is expensive and probably not worth it for a site like LibraryThing.