SEO - Promoting single app on two platforms

Hello friends,
I have started a new SEO project related to apps promotion. But little bit confused as the project is related to single app on two platforms. Already done promotion for one of the platform now the second one???s turn as it has just released. Both the apps are on same site so difficult to follow certain techniques of SEO like directory submission, social bookmarking as the domain already exists there and they will not accept the domain again. Please let me know how I can promote this app for second platform too.
Thanks waiting for your valuable suggestions.

thank you brother,
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keep it up

Keep us updated.
That will be interesting to know more about your success.

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