Tutes mainly. And I agree with sweetcherry that you just go with the flow regarding making uni friends. You sit with a bunch of interesting looking people, talk to them, and if it doesn't work, move on. Until by the end, you should have several bunches of 'random' friends who never actually know the other. I've made some separate friends with friends of my original friend (I'm always better, though, with people whom I meet through others, for some strange reason)--I think 4 so far, another with another friend of friend, and so on and so far. I also have two friends outside of pharmacy, the other day, I went with my Engineering friend to Engo Revue where I caught up with more of her friends, etc.
Uni is about experimentation--it's not just about your identity, your academic choices, but also about making friends and the social scene. Volunteering and clubs and socs are also a good way to go--I've made some other friends just from volunteering with Careers Day and hopefully I'll meet a few more interesting people at Pharmacy stall on Open Day!