This one can get pretty dark, so it’s not the place to go for an uplifting experience.
PostSecret has been around for a very long time (according to my memory), and it is firmly rooted in the physical world.
People have to actually mail actual postcards to an actual address to get them featured here.
People anonymously reveal secrets, some of which are disturbing, so you are warned. Sometimes it’s more light-hearted, of course, but secrets are scary things.
There is a need for people to be able to talk about things that affect their lives. This is one of those venues.