You can certainly use the Bama housing site to contact other kids for roommates. Also, there is usually a Facebook group for incoming freshman. BUT, should that not happen, when it’s time to pick your room assignment, you can just go in and pick any room that is open at that time. Advice DS was given was to pick a dorm w/ 2 open spots, so as not to face a 3 against 1 scenario.
Also, I know the Greek parents get mad, but I advised DS not to room with anyone who planned on pledging. From the FB groups, a lot of parents were remarking how the Greek kids were so busy, their non Greek kids felt left out and lonely. Those first weeks can be hard enough without adding that into the mix.
DS had one guy respond to his profile and never heard from him again. Day it came to pick his dorm room, told DS just to pull the guy in if he could. ?? First time he spoke to him was after he moved in. Same with his other 2 roommates. They became great friends, hung out a lot, and I felt very relieved as we are 15 hours away, so he really needed to build a life there. I was more concerned than DS, who is just too laid back for me, but seems a lot of guys are like that!