Needing advice

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I joined a site called ZenZuu and have already gotten eleven people signed under me in my first level. I promiced everyone in my first level that I would help them get ten in their first level. So far one of them has five and one of them has one. The other nine still need all ten. I have talked about it here before (their links are in my profile) and I have used my free advertising on PTR sites from being upgraded to send out their links. Where else can I go to promote their links to help them get their first ten in their first level? I am looking for free advertising, if at all possible. Any and all help is appreciated! Thanks everyone!