First of all, I've only got one account. However, I can think of other reasons for having multiple accounts besides stalking, but they're not much better. Like if you wanted to drum up fake support in a post, you could reply to it favorably from another account. Or for catfishing, Or maybe you wanted to post something anonymously. In reddit it might be handy to have two accounts so you can be in NSFW subs without it costing you the ability to post in other subs