The following comment is based on my personal experience in following a few hundred Twitter users and bloggers. It is possible what I have observed is limited to this sample and does not reflect the broader K12 population. It is an observation you can check against your own personal experiences.
Why is it educators and tech support personnel make so little online mention of technology applications in high school? It is possible high teachers or those who work with these teachers are modest and see no reason to share the activities of their students. With the exception of a few teachers who describe or support personnel who endorse flipping the classroom, one might think there is nothing going on.
There are so many interesting possibilities for older students. I would think science teachers would make heavy use of data collection (digital probes) and analysis (simple spreadsheet based statistics and graphical representation). How about GIS and GPS activities? Writing activities of all types work at any grade level and older students should be capable of journalistic efforts at a level capable of informing and influencing the general public. Students should be eligible for course-length computer science experiences with some creating impressive products demonstrating what older students can accomplish. Online access to primary source content should be a boon for the multiple history courses students take and place-based historical inquiry could allow a contribution to the resources that are available.
I am not discounting the instructional opportunities technology makes available, but I would think all of the pro making, project-based, problem-based, and computational thinking proponents would be showcasing what is happening in high school classrooms.
