It's kind of a sweet idea, really -- posting your phone number on the internet, via PostSecret, in order to connect with people. And he was refreshingly honest about it: It was a way of curing his own loneliness by curing other people's loneliness.
It amazes me that anyone could actually go through with it, especially in light of the potential repercussions. People calling at all hours, from all over the place. The risk that the callers might not be entirely sane, and might need more help than he could give. The cell phone bill. The loss of anonymity. The callers' expectations of a connection -- a way to fill their own lonely voids.
It's an unusual leap of faith.