I check post secret every sunday for the new cards. It's one addictive site. I've got a couple of blogs myself. I made one for people to come post anonymous secrets if they don't have the time to make a card and ship it in. I call it my post secret knock off blog.
On one hand I think it's great people can share their secrets with out consequence, but on the other I think it may cause people to avoid and face the realities in their lives by sending in these cards. Never the less, it has helped me just to read others secrets and empathize.