It depends on what you're trying to do. If you're just storing user data, then SQL is fine. But if you need to store a lot of information about each user, like

It depends on what you're trying to do. If you're just storing user data, then SQL is fine. But if you need to store a lot of information about each user, like their posts or comments and the corresponding metadata (like who they're replying to), then NoSQL databases are better because they're optimized for that kind of structure.