Facebook on their students for academic purposes. [ 110 ] [ 111 ] Instructors also ought to consider that rendering Facebook optional, but continuing to provide content through it to students who elect to use it, places an unfair burden on hesitant students, who then are forced to choose between using a technology they are uncomfortable with and participating fully in the course. A related limitation, particularly at the level of K-12 schooling, is the distrust (and in some cases, outright disallowal) of the use of Facebook in formal classroom settings in many educational jurisdictions. However, this hesitancy towards Facebook use is continually diminishing in the United States, as the Pew Internet & American Life Project’s annual report for 2012 shows that the likelihood of a person to be a registered Facebook user only fluctuates by 13 percent between different levels of educational attainment, 9 percent between urban, suburban, and rural users, only 5 percent between different household income brackets. The largest gap occurs between age brackets, with 86 percent of 18-29-year-olds reported as registered users as opposed to only 35 percent of 65-and-up-year-old users. [ 112 ] Twitter, also, promotes social connections among students. It can be used to enhance communication building and critical thinking. Domizi (2013) utilized Twitter in a graduate seminar requiring students to post weekly tweets to extend classroom discussions. Students reportedly used Twitter to connect with content and other students. Additionally, students found it “to be useful professionally and personally” [ 113 ] Junco, Heibergert,