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If someone is interested in using your idea, can you get some credit or something?

I need to add a terms of service. Something like: "All submitted ideas are free for all members of the site to use and act upon."

Does anyone have an example of such a TOS? One that basically says you relinquish all rights to the ideas you give on this website.

You don't have to, there are no rights to ideas in the first place.