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This looks cool, is it your own project? I've released a while back a similar project [1], and I'd be interested in knowing the technical side of the project (platform, ...).

The main problem will be creating an engaged community, since at least in my case, lots of users come in, do an action once and then they forget about the site until the next time they have something else to share.

[1] http://www.indiegamehunt.com/ (Product Hunt for indie games)