The Huffington Post article (huffingtonpost.com) about iOS apps that upload contacts in the clear & store them on their servers is pretty concerning. Where I grew up, this would have been considered totally inappropriate & scandalous. I'd be outraged if I'd had this done to me. As it is, I'm glad that most of the people I help with their stuff aren't big into the social networking stuff, so should be OK.
Not OK, & never would have dreamed that anybody else would have thought it would be!
Do we know why the reference article (& its embedded references) cite iOS, & all call out iPhone specifically, but don't mention iPad? That certainly has a whole set of contacts information.
I don't have the device myself but I was curious. First bullet point: the Kobo is not an Android device so it can't (hasn't?) be rooted but I've not known of any other hacks for it. Second: From the official site, it lists epub and pdf.