It good for bootstrapping content, but how would that fetch users. If user come to your website, then he may stick around because finds lots of other fake user.
However, that wouldn't bring user who don't know that your website even exists.
SEO and marketing then. There's plenty of resources around which discuss how to get users to your site, how you keep them there is through good content and a reason to come back.
However, that wouldn't bring user who don't know that your website even exists.