Postsecret

Source: Postsecret site

I have seen books about postsecret when I browse bookstores when I had the luxury before. Some of the things they write in here are quite painful and gives you that feel of crying and pain as well but still you have the urge to peek into people's secret and maybe find some secret that is way painful than your or maybe something you also share.

BTW you can send in your secrets at Postsecret's site or as a member in one of the postsecret swaps on swap-bot.

There is also a wonderful article on Postcrossing.