How to handle users that do not have twitter app installed?

[darkhorse2013]

See title. If twitter app is installed, sending a tweet is trivial, since the username and password is retrieved from settings. When it is not installed, the icon is removed from activity dialog box.

[hansemannn]

The method Social.isTwitterSupported() should check that internally for you. If it is false, you need a custom logic for a fallback handling (e.g. a webview for sharing).