seriously consider at the very least getting Facebook. I'd never used it before going to uni, and had had not intention of ever getting it, but like everything is posted on Facebook, Facebook messenger is really really useful for contacting people in your class when you realise you don't have their number and have a group project due the next day etc.
You don't have to like post on it or anything, but being able to check group/freshers pages is so helpful, like 3/4 of all the important info I need is on Facebook and the last 1/4 is via email