Some people love to vent, commiserate, complain, etc. You can do that using your social media accounts, but that is going to bite you eventually. There are sites where you can publish your misadventures in exchange for imaginary internet points (FML being an example), but the satisfaction just isn't immediate.
What if there was an anonymous chat service where you could just hop on, get matched up with another human that needs to vent, and talk until things feel a bit better again?
There's an opportunity to add features all the encrypted IM apps are doing these days: end-to-end encryption, disappearing messages, screenshot protection, and so on.