I don't think it's entirely impossible. On Reddit, they have a somewhat popular depression forum which is rather depressing (a typical post is something like,

I don't think it's entirely impossible. On Reddit, they have a somewhat popular depression forum which is rather depressing (a typical post is something like, "I managed to shower today" or "does anyone else feel life is meaningless?") but people seem to benefit. A service that helps people who feel down cheer up could be quite useful if done right.