For me, it was /r/confession. Once upon a time, it was a strange but cool confessional box on the internet. People shared what they did wrong, and it included murder, rape, theft, abuse... I assume some of those stories were made up, but nevertheless it made interesting read and no-judgment community. Later, SRS came in and started reporting the threads, abusing people who committed some taboo, and it died down. Later, the mods changed to SRS ones and they came up with all sorts of convoluted rules. Most posts now are not confessions at all.

So, that is my story. Do you have similar?