PostSecret - [A place that shares anonymous secrets delivered to them by postcard. Warning: some can be rough]
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PostSecret
https://postsecret.com/
https://postsecret.com/
What a blast from the past! I found this site shortly after it started while using Stumble Upon back in the day. I sent a few secrets in myself but have never seen them published. I believe this was only supposed to be a year long social experiment that did so well the guy just kept it going. I remember looking forward to the weekly updates all the time.
I bought the first book, it's still on my shelf.
The band All American Rejects also wrote a song about this project.