One thing that would be a very natural extension and really useful, would be annotations to scientific papers and books. I can't count the times I had to laborously fill in the arguments deemed trivial or obvious by the author, but were not terribly obvious at all. arxiv.org hosts a lot of them in source form, so modulo licensing issues and a good latex to html compiler, one could easily make them available for annotation. Other than that there are probably lots of interesting works that are in the public domain.

Obviously using "genius" and "iq-points" are just marketing and the number of rap fans are probably greater than the number of academics. So I don't know, if that is a viable thing to add.