Of course, most people would prefer to room with family or friends (especially if we’re talking about multiple people in the same room). That’s not an SF issue, it’s human nature. So a lot of roommate groups are going to be formed through word-of-mouth, or smaller community group chats/boards.
Check Craigslist, that’s the main place people who are looking for randoms to rent a room will post:
https://sfbay.craigslist.org/search/roo?max_price=1000&min_p...
Of course, most people would prefer to room with family or friends (especially if we’re talking about multiple people in the same room). That’s not an SF issue, it’s human nature. So a lot of roommate groups are going to be formed through word-of-mouth, or smaller community group chats/boards.