this semester, twitter is the main mode of communication used by my students and me. twitter has replaced at least three classroom technologies, and has streamlined our outside-the-classroom conversations and collaborations.
twitter has replaced the class listserv. for years, i've used a listserv (alternatively called a mailing list or discussion list) to extend our discussions beyond the classroom. these days, when we want to continue conversations, the 12 students in DMP, the 17 students in ESF, and i use twitter.
twitter has replaced email announcements. in the past, if something's come up, or i want to add a reading, or we have a location change, i would send all the students in class an email. these days, when i have something to announce, or when my students have something to announce, we use twitter.
twitter has replaced the cardboard box i used to bring to class on due dates. in the past, my students would print out their papers and bring them to class; i'd collect them in a box and take them back to the office to grade. these days, my students write blogs, design flickr sets, upload vidoe, and post works-in-progress. when finished, they tweet about it so that i - and, more importantly, their peers - can check it out.