Following suggestions for an app to help Wittertainees find other likeminded individuals, an app for your Generic fruit based device has been created by a listener to do just that. This app is not endorsed by the BBC, the presenters or, indeed, Witterpedia. However, at the moment it seems to work and comes with a handy copy of the Code of Conduct.
The app is on the Apple App Store: iWittr by Chris Mingay https://appsto.re/gb/YZ9Nab.i
There is also an Android version available called Wittr, also by Chris. https://play.google.com/store/apps/details?id=it.ct14.wittr&hl=en_GB