"I raised this with Wire, and asked whether Wire can read the content of media and messages sent using their service.
They didn't answer that question. They did, however, remove the claim that messages can only be read by the user and recipient from their website." http://motherboard.vice.com/read/wire-built-by-ex-skype-employees-retracts-promise-not-to-read-your-messages
Well, I was pretty excited to check out Wire, which promised to be a "new and modern" chat client, but the questionable privacy policies of the company pretty much ensures that won't happen.