>>213342511I was in a similar situation in grad school when I was in a group project and everyone else in my group refused to use ANY means of communication AT ALL other than Facebook. I refused to use Facebook, and they refused to use anything other than Facebook. Eventually they brought the issue to the instructor, but he sided with me.
I remember that one of the guys who seemed so upset that I wouldn't use Facebook had an Antifa sticker on his iPhone case.