Posting a link to content that is not acceptable per the STS TOS does specifically violate the TOS. As Snakespeare pointed out, by having the content on the other forum available to registered users only, each person who chooses to register there is basically "opting in" to whatever sort of content is allowed by THAT site's terms of service.
STS would be concerned only if clicking a link on this forum presented content to the user that is unacceptable per their TOS without that user's agreement.
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