Your tree
Your Tree is a night forest made of anonymous notes. You write down something you are carrying and are not going to say out loud, and it grows into a tree in a forest anyone can walk through. There are no accounts, no names and nothing to sign up for — a note carries no trace of who wrote it.
There are no moderators either. A note stays until ten different people report it — or three, if what they report is that it names a real person or is illegal — and until then its tree simply gives less light as reports come in. Everything planted stays where it was planted; the forest only grows outwards.
The forest itself is drawn with JavaScript, so you will need it switched on to walk through it. Why this exists reads fine without it.