Alt.com
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Alt.com has been connecting people with kink and BDSM interests for over two decades, predating most modern social networks. The site operates as a hybrid between a dating site and a community forum: members have profiles with stated interests and experience, and can browse others, join groups, and participate in discussions.
Free membership allows limited browsing and messaging; a paid tier opens full communication and some additional features. It sits alongside FetLife as one of the two main long-running online communities for the BDSM-oriented audience, with a slightly more dating-oriented structure than FetLife’s social-network approach.