Secret is an app that allows users to share messages anonymously among their friends, friends of friends and publicly. The app has so far had $10 million in funding since launching in December 2013. The app has become quite a hit in the US where it was first released and has become a place where some of those in the tech industry have shared some very juicy gossip.
Other than the gossip it has become a place where users share other random stuff such as jokes, first world problems and such.
The app has now become available in the UK, Ireland, Australia and New Zealand. It's currently only available for iOS.